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by Graham Williams
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Ports and Services

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.
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  


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