These are the common Network Ports
| Keyword | Number | Protocol(s) | Description | | tcpmux | 1 | TCP, UDP | TCP Port Service Multiplexer | | echo | 7 | TCP, UDP | Echo | | discard | 9 | TCP, UDP | Discard | | systat | 11 | TCP | Active Users | | daytime | 13 | TCP, UDP | Daytime (RFC 867) | | qotd | 17 | TCP | Quote of the Day | | msp | 18 | TCP, UDP | message send protocol | | chargen | 19 | TCP, UDP | Character Generator | | ftp-data | 20 | TCP, UDP | File transfer default data | | ftp | 21 | TCP, UDP | File transfer control | | ssh | 22 | TCP, UDP | Remote login protocol | | telnet | 23 | TCP, UDP | Telnet | | smtp | 25 | TCP, UDP | Simple Mail Transfer | | time | 37 | TCP, UDP | Time | | rlp | 39 | TCP, UDP | Resource location protocol | | nameserver | 42 | TCP, UDP | Host name server | | whois | 43 | TCP, UDP | Who is | | re-mail-ck | 50 | TCP, UDP | Remote mail checking protocol | | domain | 53 | TCP, UDP | Domain name server | | bootps | 67 | TCP, UDP | Bootstrap protocol server | | bootpc | 68 | TCP, UDP | Bootstrap protocol client | | tftp | 69 | TCP, UDP | Trivial file transfer protocol | | gopher | 70 | TCP, UDP | Gopher | | finger | 79 | TCP, UDP | Finger | | www | 80 | TCP, UDP | World wide web or HTTP | | kerberos | 88 | TCP, UDP | Kerberos | | supdup | 95 | TCP, UDP | SUPDUP | | hostname | 101 | TCP, UDP | NIC Host Name Server | | iso-tsap | 102 | TCP, UDP | ISO-TSAP Class 0 | | csnet-ns | 105 | TCP, UDP | CCSO name server protocol | | rtelnet | 107 | TCP, UDP | Remote Telnet Service | | pop-2 | 109 | TCP, UDP | Post Office Protocol - Version 2 | | pop-3 | 110 | TCP, UDP | Post Office Protocol - Version 3 | | sunrps | 111 | TCP, UDP | SUN Remote Procedure Call | | auth | 113 | TCP, UDP | Authentication Service | | sftp | 115 | TCP, UDP | Simple File Transfer Protocol | | uucp-path | 117 | TCP, UDP | UUCP Path Service | | nntp | 119 | TCP, UDP | Network News Transfer Protocol | | nyp | 123 | TCP, UDP | Network Time Protocol | | netbios-ne | 137 | TCP, UDP | NETBIOS Name Service | | netbios-dgram | 138 | TCP, UDP | NETBIOS Datagram Service | | netbios-ssn | 139 | TCP, UDP | NETBIOS Session Service | | imap | 143 | TCP, UDP | Internet Message Access Protocol | | snmp | 161 | TCP, UDP | SNMP | | snmp-trap | 162 | TCP, UDP | SNMPTRAP | | cmip-man | 163 | TCP, UDP | CMIP/TCP Manager | | cmip-agent | 164 | TCP, UDP | CMIP/TCP Agent | | xdmcp | 177 | TCP, UDP | X Display Manager Control Protocol | | nextstep | 178 | TCP, UDP | NextStep Window Server | | bgp | 179 | TCP, UDP | Border Gateway Protocol | | prospero | 191 | TCP, UDP | Prospero Directory Service | | irc | 194 | TCP, UDP | Internet Relay Chat Protocol | | smux | 199 | TCP, UDP | SMUX |
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