by Graham Williams
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GNU/Linux Desktop Survival Guide
by Graham Williams |
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Ports and Services | 
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20201104 Specific port numbers may have standard services listening on them. Below are examples. For security purposes, today most ports are closed by default rather than in a previous trusting era where most ports were open by default.
| 7 | echo | ||
| 9 | discard | /dev/null but for networks. | |
| 13 | daytime | Current date Mon Nov 16 07:14:21 2020. |
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| 17 | quotd | ||
| 20 | ftp-data | ||
| 21 | ftp | ||
| 22 | ssh | ||
| 23 | telnet | ||
| 25 | smtp | ||
| 37 | time | Current time as seconds since the epoch. | |
| 53 | domain | ||
| 70 | gopher | ||
| 79 | finger | ||
| 80 | http | ||
| 110 | pop3 | ||
| 111 | sunrpc | ||
| 113 | auth | The IDENT protocol used by IRC, some FTP and postgresql. | |
| 119 | nntp | Network News Transport Service. | |
| 123 | ntp | ||
| 143 | imap2 | ||
| 161 | udp | snmp | Simple Net Management Protocol |
| 194 | tcp | irc | Internet Relay Chat |
| 194 | udp | irc | |
| 220 | imap3 | ||
| 389 | tcp | ldap | Lightweight Directory Access Protocol |
| 443 | tcp | https | Secure HTTP |
| 873 | tcp | rsync | Efficient protocol for copying and syncing files. |
| 2049 | tcp | nfs | Advertises the export list for NFS. |
| 2049 | udp | nfs | |
| 3306 | tcp | mysql | |
| 6000 | X Window System | ||
| 6667 | udp | ircd | Internet Relay Chat |
| 8080 | tcp | webcache | WWW caching service |
| 32860 | udp | nlockmgr |