This is just my list of common TCP/IP ports so I don't have to search through some huge list.
Port | Used for |
---|---|
20, 21 | FTP |
22 | SSH |
25 | SMTP |
53 | DNS |
80 | HTTP |
110 | POP3 |
123 | NTP |
143 | IMAP |
443 | HTTPS |
445 | Microsoft Directory Services |
902 | VMWare Management Console |
1433 | Microsoft SQLServer |
3306 | MySQL |
3389 | Microsoft Terminal Server (RDP) |
5500+ | VNC server connecting to viewer |
5800 | VNC web interface |
5900+ | VNC viewer connecting to server |
For completeness, here are some other common ports that you might come across:
Port | Used for |
---|---|
23 | telnet |
68 | DHCP |
79 | finger |
113 | IDENT Steve Gibson article on why you see it - my install of ProFTPd did it until I specifically disabled it. |
119 | NNTP |
135, 137, 139 | Microsoft Networking |
161 | SNMP |
194 | IRC |
389 | LDAP |
500 | IKMP - used for VPNs |
1311 | Dell OpenManage's Web Server |
These are ports that you should never have open since they are favorite crack targets:
Port | Used for |
---|
/etc/services
\WINDOWS\SYSTEM32\DRIVERS\ETC\SERVICES