diff --git a/libnetutil/HopByHopHeader.cc b/libnetutil/HopByHopHeader.cc
index 735c66ea5..c3b8cc450 100644
--- a/libnetutil/HopByHopHeader.cc
+++ b/libnetutil/HopByHopHeader.cc
@@ -427,7 +427,7 @@ int HopByHopHeader::addOption(u8 type, u8 len, const u8 *data){
 
 
 /* If the current length of the extension header is not a multiple of 8 octets,
- * this method adds the neccessary padding (either PadN or Pad1 options)*/
+ * this method adds the necessary padding (either PadN or Pad1 options)*/
 int HopByHopHeader::addPadding(){
   u8 zeroes[8]={0,0,0,0,0,0,0,0};
   int required_octets=8-(this->length%8);
diff --git a/libnetutil/ICMPv4Header.cc b/libnetutil/ICMPv4Header.cc
index e5b8a4537..ef9cc0a83 100755
--- a/libnetutil/ICMPv4Header.cc
+++ b/libnetutil/ICMPv4Header.cc
@@ -1029,7 +1029,7 @@ u32 ICMPv4Header::getOutputLinkMTU() const {
 } /* End of getOutputLinkMTU() */
 
 
-/* Miscellanious *************************************************************/
+/* Miscellaneous *************************************************************/
 /** Returns the standard ICMP header length for the supplied ICMP message type.
  *  @warning Return value corresponds strictly to the ICMP header, this is,
  *  the minimum length of the ICMP header, variable length payload is never
diff --git a/libnetutil/IPv4Header.cc b/libnetutil/IPv4Header.cc
index 2ee893840..81ec9e063 100644
--- a/libnetutil/IPv4Header.cc
+++ b/libnetutil/IPv4Header.cc
@@ -665,7 +665,7 @@ int IPv4Header::setOpts(const char *txt){
 int IPv4Header::setOpts(u8 *opts_buff,  u32 opts_len){
   if(opts_buff==NULL || opts_len==0)
    return OP_FAILURE;
-  assert(opts_len<=MAX_IP_OPTIONS_LEN); /* Max lenght for IP options */
+  assert(opts_len<=MAX_IP_OPTIONS_LEN); /* Max length for IP options */
   memcpy(this->h.options, opts_buff, opts_len);
   this->ipoptlen=opts_len;
   this->length += opts_len;
diff --git a/libnetutil/IPv4Header.h b/libnetutil/IPv4Header.h
index c54a03ec2..eb488ee57 100644
--- a/libnetutil/IPv4Header.h
+++ b/libnetutil/IPv4Header.h
@@ -130,7 +130,7 @@
 #include "NetworkLayerElement.h"
 
 #define IP_RF 0x8000               /* Reserved fragment flag         */
-#define IP_DF 0x4000               /* Dont fragment flag             */
+#define IP_DF 0x4000               /* Don't fragment flag            */
 #define IP_MF 0x2000               /* More fragments flag            */
 #define IP_OFFMASK 0x1fff          /* Mask for fragmenting bits      */
 #define IP_HEADER_LEN 20           /* Length of the standard header  */
@@ -213,7 +213,7 @@ class IPv4Header : public NetworkLayerElement {
         int setTOS(u8 v);
         u8 getTOS() const;
 
-        /* Total lenght of the datagram */
+        /* Total length of the datagram */
         int setTotalLength();
         int setTotalLength(u16 l);
         u16 getTotalLength() const;
diff --git a/libnetutil/PacketElement.h b/libnetutil/PacketElement.h
index be0477981..9d1c23bfe 100644
--- a/libnetutil/PacketElement.h
+++ b/libnetutil/PacketElement.h
@@ -253,7 +253,7 @@ class PacketElement {
     } /* End of getBinaryBuffer() */
 
 
-    /** Returns the lenght of this PacketElement + the length of all the
+    /** Returns the length of this PacketElement + the length of all the
      *  PacketElements that are next to it (are linked trough the "next"
      *  attribute). So for example, if we have IPv4Header p1, linked to
      *  a TCPHeader p2, representing a simple TCP SYN with no options,
diff --git a/libnetutil/RoutingHeader.cc b/libnetutil/RoutingHeader.cc
index bfbb2be19..0b1cd4e3c 100644
--- a/libnetutil/RoutingHeader.cc
+++ b/libnetutil/RoutingHeader.cc
@@ -169,7 +169,7 @@ int RoutingHeader::storeRecvData(const u8 *buf, size_t len){
     this->length=0;
     return OP_FAILURE;
   }else{
-     /* Store the first 4 bytes, so we can access lenght and routing type */
+     /* Store the first 4 bytes, so we can access length and routing type */
      memcpy(&(this->h), buf, 4);
 
      /* Our behaviour is different depending on the routing type. */
diff --git a/libnetutil/UDPHeader.cc b/libnetutil/UDPHeader.cc
index ae058dea4..997e01ad9 100644
--- a/libnetutil/UDPHeader.cc
+++ b/libnetutil/UDPHeader.cc
@@ -338,26 +338,26 @@ int UDPHeader::setTotalLength(){
   * here because UDP is supposed to be independent of IPv4, IPv6 or
   * whatever other network layer protocol is used to carry the UDP datagrams.*/
   if ((mylen+otherslen) > 65535 || (mylen+otherslen)<8 ){
-    printf("UDPHeader::setTotalLenght(): Invalid length.\n");
+    printf("UDPHeader::setTotalLength(): Invalid length.\n");
     return OP_FAILURE;
   }
 
   h.uh_ulen=htons( mylen+otherslen );
 
   return OP_SUCCESS;
-} /* End of setTotalLenght() */
+} /* End of setTotalLength() */
 
 
 /** @warning Supplied value MUST be in HOST byte order */
 int UDPHeader::setTotalLength(u16 l){
   this->h.uh_ulen=htons(l);
   return OP_SUCCESS;
-} /* End of setTotalLenght() */
+} /* End of setTotalLength() */
 
 
 /** @warning Returned value is in HOST byte order */
 u16 UDPHeader::getTotalLength() const {
   return ntohs(this->h.uh_ulen);
-} /* End of getTotalLenght() */
+} /* End of getTotalLength() */
 
 
diff --git a/mswin32/NETINET/IP.H b/mswin32/NETINET/IP.H
index fc3721d56..e32d5ae9f 100644
--- a/mswin32/NETINET/IP.H
+++ b/mswin32/NETINET/IP.H
@@ -69,7 +69,7 @@ struct ip {
 	short	ip_len;			/* total length */
 	u_short	ip_id;			/* identification */
 	short	ip_off;			/* fragment offset field */
-#define	IP_DF 0x4000			/* dont fragment flag */
+#define	IP_DF 0x4000			/* don't fragment flag */
 #define	IP_MF 0x2000			/* more fragments flag */
 #define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */
 	u_char	ip_ttl;			/* time to live */
diff --git a/mswin32/packet_types.h b/mswin32/packet_types.h
index ff7db82c8..90b5301ca 100644
--- a/mswin32/packet_types.h
+++ b/mswin32/packet_types.h
@@ -17,7 +17,7 @@ struct ip
     u_short ip_id;                      /* identification */
     u_short ip_off;                     /* fragment offset field */
 #define IP_RF 0x8000                    /* reserved fragment flag */
-#define IP_DF 0x4000                    /* dont fragment flag */
+#define IP_DF 0x4000                    /* don't fragment flag */
 #define IP_MF 0x2000                    /* more fragments flag */
 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
     u_char ip_ttl;                    /* time to live */
@@ -151,7 +151,7 @@ struct iphdr {
 	short	ip_len;			/* total length */
 	u_short	ip_id;			/* identification */
 	short	ip_off;			/* fragment offset field */
-#define	IP_DF 0x4000		/* dont fragment flag */
+#define	IP_DF 0x4000		/* don't fragment flag */
 #define	IP_MF 0x2000		/* more fragments flag */
 	u_char	ip_ttl;			/* time to live */
 	u_char	ip_p;			/* protocol */
diff --git a/mswin32/pcap-include/Packet32.h b/mswin32/pcap-include/Packet32.h
index 64be055d9..c821d2951 100644
--- a/mswin32/pcap-include/Packet32.h
+++ b/mswin32/pcap-include/Packet32.h
@@ -284,7 +284,7 @@ struct _PACKET_OID_DATA {
     ULONG Oid;					///< OID code. See the Microsoft DDK documentation or the file ntddndis.h
 								///< for a complete list of valid codes.
     ULONG Length;				///< Length of the data field
-    UCHAR Data[1];				///< variable-lenght field that contains the information passed to or received 
+    UCHAR Data[1];				///< variable-length field that contains the information passed to or received 
 								///< from the adapter.
 }; 
 typedef struct _PACKET_OID_DATA PACKET_OID_DATA, *PPACKET_OID_DATA;
diff --git a/mswin32/pcap-include/pcap/bpf.h b/mswin32/pcap-include/pcap/bpf.h
index 9f4ca33e3..8a25c406f 100644
--- a/mswin32/pcap-include/pcap/bpf.h
+++ b/mswin32/pcap-include/pcap/bpf.h
@@ -446,7 +446,7 @@ struct bpf_version {
  * interface (irdaX), but not on a raw serial port.
  * Note the capture is done in "Linux-cooked" mode, so each packet include
  * a fake packet header (struct sll_header). This is because IrDA packet
- * decoding is dependant on the direction of the packet (incomming or
+ * decoding is dependent on the direction of the packet (incoming or
  * outgoing).
  * When/if other platform implement IrDA capture, we may revisit the
  * issue and define a real DLT_IRDA...
diff --git a/mswin32/pcap-include/remote-ext.h b/mswin32/pcap-include/remote-ext.h
index 35a2fff6c..e03eede09 100644
--- a/mswin32/pcap-include/remote-ext.h
+++ b/mswin32/pcap-include/remote-ext.h
@@ -395,7 +395,7 @@ struct pcap_samp
 
 
 
-//! Maximum lenght of an host name (needed for the RPCAP active mode)
+//! Maximum length of an host name (needed for the RPCAP active mode)
 #define RPCAP_HOSTLIST_SIZE 1024
 
 
diff --git a/mswin32/winclude.h b/mswin32/winclude.h
index d3f6dc5ae..8fefe57b6 100644
--- a/mswin32/winclude.h
+++ b/mswin32/winclude.h
@@ -1,6 +1,6 @@
 /***************************************************************************
  * winclude.h -- some windows include files and                            *
- * windows-compatabilty-related functions that are specific to Nmap.  Most *
+ * windows-compatibility-related functions that are specific to Nmap. Most *
  * of this has been moved into nbase so it can be shared.                  *
  *                                                                         *
  ***********************IMPORTANT NMAP LICENSE TERMS************************
diff --git a/mswin32/winfix.cc b/mswin32/winfix.cc
index 5cb0f5fa3..63858ad7d 100644
--- a/mswin32/winfix.cc
+++ b/mswin32/winfix.cc
@@ -1,6 +1,6 @@
 
 /***************************************************************************
- * winfix.cc -- A few trivial windows-compatabilty-related functions that  *
+ * winfix.cc -- A few trivial windows-compatibility-related functions that *
  * are specific to Nmap.  Most of this has been moved into nbase so it can *
  * be shared.                                                              *
  *                                                                         *
diff --git a/nmap-os-db b/nmap-os-db
index e5a3681cb..57fd535b5 100644
--- a/nmap-os-db
+++ b/nmap-os-db
@@ -14,7 +14,7 @@
 # LLC.  It is distributed under the Nmap Open Source license as
 # provided in the COPYING file of the source distribution or at
 # http://nmap.org/data/COPYING .  Note that this license
-# requires you to license your own work under a compatable open source
+# requires you to license your own work under a compatible open source
 # license.  If you wish to embed Nmap technology into proprietary
 # software, we sell alternative licenses (contact sales@insecure.com).
 # Dozens of software vendors already license Nmap technology such as
@@ -56121,7 +56121,7 @@ IE(DFI=S%T=7B-85%TG=80%CD=Z)
 # Windows 5.1 (Build 2600.xpsp_sp3_gdr.090804-1435 : Service Pack 3)
 # AT&T Uverse home DVR
 # AT&T U-Verse Motorola set top boxes 
-# Media Reciever 300, Vendor: T-Home (Germany), CE 5.0
+# Media Receiver 300, Vendor: T-Home (Germany), CE 5.0
 # XP64 with all available Windows updates
 Fingerprint AT&T U-Verse set-top box (Windows CE 5.0)
 Class Microsoft | Windows | PocketPC/CE | media device
diff --git a/nmap-payloads b/nmap-payloads
index a9b71e2ae..d356ca1b8 100644
--- a/nmap-payloads
+++ b/nmap-payloads
@@ -11,7 +11,7 @@
 # LLC.  It is distributed under the Nmap Open Source license as
 # provided in the COPYING file of the source distribution or at
 # http://nmap.org/data/COPYING .  Note that this license
-# requires you to license your own work under a compatable open source
+# requires you to license your own work under a compatible open source
 # license.  If you wish to embed Nmap technology into proprietary
 # software, we sell alternative licenses (contact sales@insecure.com).
 # Dozens of software vendors already license Nmap technology such as
diff --git a/nmap-service-probes b/nmap-service-probes
index 2f3d351ce..753f6c24a 100644
--- a/nmap-service-probes
+++ b/nmap-service-probes
@@ -22,7 +22,7 @@
 # LLC.  It is distributed under the Nmap Open Source license as
 # provided in the COPYING file of the source distribution or at
 # http://nmap.org/data/COPYING .  Note that this license
-# requires you to license your own work under a compatable open source
+# requires you to license your own work under a compatible open source
 # license.  If you wish to embed Nmap technology into proprietary
 # software, we sell alternative licenses (contact sales@insecure.com).
 # Dozens of software vendors already license Nmap technology such as
@@ -2544,7 +2544,7 @@ match smtp m|^220 CheckPoint FireWall-1 secure SMTP server\r\n$| p/Checkpoint Fi
 match smtp m|^220 ([-.+\w]+) running IBM AS/400 SMTP V([\w]+)| p|IBM AS/400 smtpd| v/$2/ h/$1/
 match smtp m|^220 ([-.+\w]+) ESMTP MailEnable Service, Version: (\d[\w.]+)- ready at | p/MailEnable smptd/ v/$2/ o/Windows/ h/$1/ cpe:/o:microsoft:windows/a
 match smtp m|^220 ([-.+\w]+) ESMTP Mail Enable SMTP Service, Version: (\d[\w.]+)-- ready at| p/MailEnable smptd/ v/$2/ o/Windows/ h/$1/ cpe:/o:microsoft:windows/a
-# Enterprise version number seems to be preceeded by "0--"; Professional with "0-"
+# Enterprise version number seems to be preceded by "0--"; Professional with "0-"
 match smtp m|^220 ([-.+\w]+) ESMTP MailEnable Service, Version: \d+--([\d.]+) ready at| p/MailEnable Enterprise smptd/ v/$2/ o/Windows/ h/$1/ cpe:/o:microsoft:windows/a
 # Catch-alls. Hyphens aren't making sense -Doug
 match smtp m|^220 ([-.+\w]+) ESMTP MailEnable Service, Version: ([\w._-]+) ready at| p/MailEnable smptd/ v/$2/ o/Windows/ h/$1/ cpe:/o:microsoft:windows/a
@@ -4540,7 +4540,7 @@ match http m|^HTTP/1\.0 400 msg=Bad%20Request&rc=%00%00%03%1b\r\n| p/TimesTen ht
 match http m|^HTTP/1\.1 400  Bad  request\r\nContent-Type: text/html; charset=ISO-8859-1\r\n\r\n<body><h1>HTTP/1\.1 400  Bad  request <h1></body>| p/XOSoft WanSync http config/ o/Windows/ cpe:/o:microsoft:windows/a
 match http m|^HTTP/\*\.\* 400 Bad Request\r\nDate: .*\r\nContent-Type:text/plain\r\nContent-Length:61\r\n\r\nThe received request is either NULL or invalid/wrong format\r\n| p/Kaba application server httpd/
 
-# This lame service responds in many wierd ways - luckily always to GenericLines
+# This lame service responds in many weird ways - luckily always to GenericLines
 match http m|^HTTP/1\.1 403 Forbidden\r\nContent-Type: text/xml\r\n\r\n<\?xml version='1\.0' encoding='UTF-8' \?><autnresponse><action>NONE</action><response>The action you attempted is forbidden by your client</response></autnresponse>| p/Veritas backup exec continuous protection httpd/
 match http m|^HTTP/1\.1 403 Forbidden\nContent-Type: text/xml\n\n<ACTION>GETSTATUS</ACTION><RESPONSE>The action you attempted is forbidden by your client</RESPONSE>| p/Veritas backup exec continuous protection httpd/
 match http m|^HTTP/1\.0 200 OK\r\nContent-type: text/html\r\n\r\n\n\nCONNECTION NOT AUTHORIZED\n\n\n| p/Veritas backup exec continuous protection httpd/ i/unauthorized/
diff --git a/nmap-services b/nmap-services
index e9948edf7..2ff04cd4e 100644
--- a/nmap-services
+++ b/nmap-services
@@ -11,7 +11,7 @@
 # LLC.  It is distributed under the Nmap Open Source license as
 # provided in the COPYING file of the source distribution or at
 # http://nmap.org/data/COPYING .  Note that this license
-# requires you to license your own work under a compatable open source
+# requires you to license your own work under a compatible open source
 # license.  If you wish to embed Nmap technology into proprietary
 # software, we sell alternative licenses (contact sales@insecure.com).
 # Dozens of software vendors already license Nmap technology such as
diff --git a/nmap.cc b/nmap.cc
index a784ceb50..febcca98d 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -878,7 +878,7 @@ void parse_options(int argc, char **argv) {
           o.idlescan = 1;
           o.idleProxy = strdup(optarg);
         } else if (strcmp(long_options[option_index].name, "vv") == 0) {
-          /* Compatability hack ... ugly */
+          /* Compatibility hack ... ugly */
           o.verbose += 2;
         } else if (strcmp(long_options[option_index].name, "ff") == 0) {
           o.fragscan += 16;
diff --git a/nping/docs/EchoProtoRFC.txt b/nping/docs/EchoProtoRFC.txt
index 084abec15..e81941182 100644
--- a/nping/docs/EchoProtoRFC.txt
+++ b/nping/docs/EchoProtoRFC.txt
@@ -602,7 +602,7 @@ This documents presents the technical specification of the Nping Echo Protocol.
 
         PacketSpec:  864 bits.
             Tells the server which header fields should be checked to match
-            a captured packet with the client that sent it. This is neccessary
+            a captured packet with the client that sent it. This is necessary
             as the server supports multiple user sessions at a time, and needs
             a way to distinguish the packets.
 
@@ -1123,7 +1123,7 @@ This documents presents the technical specification of the Nping Echo Protocol.
         For each party producing encrypted data, the first initialization
         vector should be the nonce that this same party generated during the
         authentication handshake phase. If the nonce has more bits than needed,
-        only the neccessary number of bits should be used. These bits should be
+        only the necessary number of bits should be used. These bits should be
         the most significant ones.
 
         The initialization vector for subsequent encryption operations should
diff --git a/nping/nping-dev/EchoProtoRFC_v0.txt b/nping/nping-dev/EchoProtoRFC_v0.txt
index 5d860efb3..65f1a88ef 100644
--- a/nping/nping-dev/EchoProtoRFC_v0.txt
+++ b/nping/nping-dev/EchoProtoRFC_v0.txt
@@ -682,7 +682,7 @@ packets they send look like when they reach their destination.
         Unless Nping is compiled without OpenSSL support, all Nping Echo 
         Protocol (NEP) packets are transmitted encrypted. Rijndael/AES standard
         is used. It has a block size of 128 bits, that's why all NEP packets
-        must have a lenght that is multiple of 16 bytes.
+        must have a length that is multiple of 16 bytes.
 
         Every NEP packet includes a SHA-256 checksum. SHA-256 has been chosen
         over MD5 or SHA1, just to be safe in the future. MD5 is already broken
diff --git a/nping/nping-dev/NpingCommandLine.txt b/nping/nping-dev/NpingCommandLine.txt
index 775c9b4b1..95a4a727f 100644
--- a/nping/nping-dev/NpingCommandLine.txt
+++ b/nping/nping-dev/NpingCommandLine.txt
@@ -63,7 +63,7 @@ IP OPTIONS:
                  {target specification} ). 
   --tos <val>  : Set type of service field (8bits).
   --id  <val>  : Set identification field (16 bits).
-  --df         : Set Dont Fragment flag.
+  --df         : Set Don't Fragment flag.
   --mf         : Set More Fragments flag.
   --ttl <val>  : Set time to live [0-256].
   --badsum-ip  : Use a random invalid checksum. 
diff --git a/nping/nping-dev/ipv6fp.py b/nping/nping-dev/ipv6fp.py
index 6167933e1..b21dbdd36 100755
--- a/nping/nping-dev/ipv6fp.py
+++ b/nping/nping-dev/ipv6fp.py
@@ -3920,7 +3920,7 @@ def write_results_file():
         output_file.write(line)
         output_file.write("\r\n")
 
-    # Write OS details request if we dont have OS info
+    # Write OS details request if we don't have OS info
     if target_os_details_g==None:
         req=get_results_file_osrequest()
         for line in req :
diff --git a/nping/nping-dev/test/test_nping.sh b/nping/nping-dev/test/test_nping.sh
index e5e77b672..45eac5649 100755
--- a/nping/nping-dev/test/test_nping.sh
+++ b/nping/nping-dev/test/test_nping.sh
@@ -626,7 +626,7 @@ sudo nping --icmp $TARGETS $GLOBALOPTS --icmp-type echo --icmp-code boguscode
 t ICMP_51 "Run ICMP mode supplying a number code, NON-RFC compliant." \
 sudo nping --icmp $TARGETS $GLOBALOPTS --icmp-type echo --icmp-code 99
 
-t ICMP_52 "Set ICMP Identifier. (Dont get confused with output for the IP id value)" \
+t ICMP_52 "Set ICMP Identifier. (Don't get confused with output for the IP id value)" \
 sudo nping --icmp $TARGETS $GLOBALOPTS --icmp-type echo --icmp-code 9 --icmp-id 2
 
 t ICMP_53 "Set bogus Identifier. Expected: error message" \
diff --git a/nselib/brute.lua b/nselib/brute.lua
index bb4235564..16c6e6329 100644
--- a/nselib/brute.lua
+++ b/nselib/brute.lua
@@ -729,7 +729,7 @@ Engine =
       self.threads[co].running = true
     end
 
-    -- wait for all threads to finnish running
+    -- wait for all threads to finish running
     while self:threadCount()>0 do condvar "wait" end
 
     local valid_accounts
diff --git a/nselib/informix.lua b/nselib/informix.lua
index 0605fb835..ee23538f6 100644
--- a/nselib/informix.lua
+++ b/nselib/informix.lua
@@ -537,7 +537,7 @@ MessageDecoders = {
     status, data = socket:receive_buf(match.numbytes(26), true)
     if( not(status) ) then return false, "Failed to read column data" end
 
-    -- signal finnish reading
+    -- signal finish reading
     status, data = socket:send( tostring(Packet.SQ_ID:new( info.id, nil, "end" ) ) )
     status, data = socket:receive_buf(match.numbytes(2), true)
 
diff --git a/nselib/ldap.lua b/nselib/ldap.lua
index 132589475..2609e07b3 100644
--- a/nselib/ldap.lua
+++ b/nselib/ldap.lua
@@ -208,7 +208,7 @@ end
 --
 -- This function has a concept of softerrors which populates the return tables error information
 -- while returning a true status. The reason for this is that LDAP may return a number of records
--- and then finnish of with an error like SIZE LIMIT EXCEEDED. We still want to return the records
+-- and then finish off with an error like SIZE LIMIT EXCEEDED. We still want to return the records
 -- that were received prior to the error. In order to achieve this and not terminating the script
 -- by returning a false status a true status is returned together with a table containing all searchentries.
 -- This table has the <code>errorMessage</code> and <code>resultCode</code> entries set with the error information.
diff --git a/nselib/msrpc.lua b/nselib/msrpc.lua
index 36ef66eaf..7c862f93f 100644
--- a/nselib/msrpc.lua
+++ b/nselib/msrpc.lua
@@ -1086,7 +1086,7 @@ end
 -- http://msdn.microsoft.com/en-us/library/cc244831%28v=prot.10%29
 --@param smbstate         The SMB state table
 --@param printer_handle    Printer handle returned by spoolss_open_printer()
---@param data              Actuall data to write to a file
+--@param data              Actual data to write to a file
 --@return (status, result) If status is false, result is an error message. Otherwise, result is number of bytes written.
 function spoolss_write_printer(smbstate,printer_handle,data)
   stdnse.print_debug("len %d", #data)
@@ -1928,7 +1928,7 @@ end
 --
 --@param smbstate       The SMB state table
 --@param alias_handle   The alias_handle, already marshaled
---@param args      Actuall data to send, already marshaled
+--@param args      Actual data to send, already marshaled
 --@return (status, result) If status is false, result is an error message. Otherwise, result is a table of values.
 function samr_getaliasmembership(smbstate, alias_handle,args)
   local status, result
diff --git a/nselib/tftp.lua b/nselib/tftp.lua
index 8779b41f2..2f81e99a1 100644
--- a/nselib/tftp.lua
+++ b/nselib/tftp.lua
@@ -304,7 +304,7 @@ end
 
 local function waitLast()
   -- The thread that started the server needs to wait here until the rest
-  -- of the scripts finnish running. We know we are done once the state
+  -- of the scripts finish running. We know we are done once the state
   -- shifts to STOPPED and we get a signal from the condvar in the
   -- dispatcher
   local s_condvar = nmap.condvar(state)
diff --git a/scan_engine.h b/scan_engine.h
index 06db23fd0..c8d958633 100644
--- a/scan_engine.h
+++ b/scan_engine.h
@@ -1,7 +1,7 @@
 
 /***************************************************************************
  * scan_engine.h -- Includes much of the "engine" functions for scanning,  *
- * such as ultra_scan.  It also includes dependant functions such as       *
+ * such as ultra_scan.  It also includes dependent functions such as       *
  * those for collecting SYN/connect scan responses.                        *
  *                                                                         *
  ***********************IMPORTANT NMAP LICENSE TERMS************************
diff --git a/scripts/afp-brute.nse b/scripts/afp-brute.nse
index d963074d3..c032b480e 100644
--- a/scripts/afp-brute.nse
+++ b/scripts/afp-brute.nse
@@ -29,7 +29,7 @@ Performs password guessing against Apple Filing Protocol (AFP).
 -- Snow Leopard
 -- ------------
 -- - Delay 10 seconds for accounts with more than 5 incorrect login attempts (good)
--- - Instant response if password is successfull
+-- - Instant response if password is successful
 --
 -- Netatalk
 -- --------
diff --git a/scripts/domino-enum-users.nse b/scripts/domino-enum-users.nse
index bfafaf2e1..d54619c08 100644
--- a/scripts/domino-enum-users.nse
+++ b/scripts/domino-enum-users.nse
@@ -18,8 +18,8 @@ Attempts to discover valid IBM Lotus Domino users and download their ID files by
 -- 1352/tcp open  lotusnotes
 -- | domino-enum-users:
 -- |   User "Patrik Karlsson" found, but not ID file could be downloaded
--- |   Succesfully stored "FFlintstone" in /tmp/FFlintstone.id
--- |_  Succesfully stored "MJacksson" in /tmp/MJacksson.id
+-- |   Successfully stored "FFlintstone" in /tmp/FFlintstone.id
+-- |_  Successfully stored "MJacksson" in /tmp/MJacksson.id
 --
 --
 -- @args domino-id.path the location to which any retrieved ID files are stored
@@ -107,13 +107,13 @@ action = function(host, port)
       local status, err = saveIDFile( filename, data )
 
       if ( status ) then
-        table.insert(result, ("Succesfully stored \"%s\" in %s"):format(username, filename) )
+        table.insert(result, ("Successfully stored \"%s\" in %s"):format(username, filename) )
       else
         stdnse.print_debug( err )
         table.insert(result, ("Failed to store \"%s\" to %s"):format(username, filename) )
       end
     elseif( status and data ) then
-      table.insert(result, ("Succesfully retrieved ID for \"%s\" (to store set the domino-enum-users.path argument)"):format(username) )
+      table.insert(result, ("Successfully retrieved ID for \"%s\" (to store set the domino-enum-users.path argument)"):format(username) )
     elseif ( status ) then
       table.insert(result, ("User \"%s\" found, but no ID file could be downloaded"):format(username) )
     end
diff --git a/scripts/drda-brute.nse b/scripts/drda-brute.nse
index ca6302cb4..8982b0f53 100644
--- a/scripts/drda-brute.nse
+++ b/scripts/drda-brute.nse
@@ -163,7 +163,7 @@ action = function( host, port )
     threads[co] = true
   end
 
-  -- wait for all threads to finnish running
+  -- wait for all threads to finish running
   while threadCount(threads)>0 do
     condvar("wait")
   end
diff --git a/scripts/http-domino-enum-passwords.nse b/scripts/http-domino-enum-passwords.nse
index 28b6571c5..1f03b780e 100644
--- a/scripts/http-domino-enum-passwords.nse
+++ b/scripts/http-domino-enum-passwords.nse
@@ -122,7 +122,7 @@ end
 -- @return true on valid access, false on failure
 local function isValidCredential( host, port, path, user, pass )
   -- we need to supply the no_cache directive, or else the http library
-  -- incorrectly tells us that the authentication was successfull
+  -- incorrectly tells us that the authentication was successful
   local result = http.get( host, port, path, { auth = { username = user, password = pass }, no_cache = true })
 
   if ( result.status == 401 ) then
diff --git a/scripts/http-fileupload-exploiter.nse b/scripts/http-fileupload-exploiter.nse
index 3b6dfabc4..56c47b190 100644
--- a/scripts/http-fileupload-exploiter.nse
+++ b/scripts/http-fileupload-exploiter.nse
@@ -45,7 +45,7 @@ payload in the comment.
 -- 80/tcp open  http    syn-ack
 -- |   Testing page /post.html
 -- |
--- |     Succesfully uploaded and executed payloads:
+-- |     Successfully uploaded and executed payloads:
 -- |      Filename: 1.php, MIME: text/plain
 -- |_     Filename: 1.php3, MIME: text/plain
 ---
@@ -152,7 +152,7 @@ end
 local makeAndCheckRequests = function(uploadspaths)
 
   local exit = 0
-  local output = {"Succesfully uploaded and executed payloads: "}
+  local output = {"Successfully uploaded and executed payloads: "}
 
   for i=1, #listofrequests, 1 do
     listofrequests[i]:make()
diff --git a/scripts/http-form-brute.nse b/scripts/http-form-brute.nse
index ca167bb8e..edaee71ca 100644
--- a/scripts/http-form-brute.nse
+++ b/scripts/http-form-brute.nse
@@ -104,7 +104,7 @@ Driver = {
 
   login = function( self, username, password )
     -- we need to supply the no_cache directive, or else the http library
-    -- incorrectly tells us that the authentication was successfull
+    -- incorrectly tells us that the authentication was successful
     local postparams = { [self.options.passvar] = password }
     if ( self.options.uservar ) then postparams[self.options.uservar] = username end
 
diff --git a/scripts/http-open-proxy.nse b/scripts/http-open-proxy.nse
index 33e636a95..ebf3f3394 100644
--- a/scripts/http-open-proxy.nse
+++ b/scripts/http-open-proxy.nse
@@ -89,7 +89,7 @@ end
 -- Seconde: Request to wikipedia.org and checks for wikimedia pattern
 -- Third: Request to computerhistory.org and checks for museum pattern
 --
--- If any of the requests is succesful, the proxy is considered open
+-- If any of the requests is successful, the proxy is considered open
 -- If all get requests return the same result, the user is alerted that
 -- the proxy might be redirecting his requests (very common on wi-fi
 -- connections at airports, cafes, etc.)
diff --git a/scripts/ntp-monlist.nse b/scripts/ntp-monlist.nse
index f95618693..cdb38c49e 100644
--- a/scripts/ntp-monlist.nse
+++ b/scripts/ntp-monlist.nse
@@ -407,7 +407,7 @@ function check(status, response, track)
     -- NoOp
   elseif err == 1 then
     fail = true
-    msg = 'Incompatable Implementation Number'
+    msg = 'Incompatible Implementation Number'
   elseif err == 2 then
     fail = true
     msg = 'Unimplemented Request Code'