| Port | TCP | UDP | Description |
| 20 | x | FTP-Data | |
| 21 | x | FTP (login access) | |
| 22 | x | x | SSH |
| 23 | x | Telent | |
| 25 | x | SMTP (Mail, MTA) | |
| 49 | x | TACACS+ | |
| 53 | x | x | DNS |
| 69 | x | TFTP | |
| 80 | x | x | HTTP (Web) |
| 110 | x | x | POP3 (email); generally uses TCP) |
| 119 | x | NNTP (Usenet News) | |
| 123 | x | NTP | |
| 139 | x | x | NetBIOS (Microsoft) |
| 143 | x | x | IMAP |
| 161 | x | x | SNMP (Network Monitor) |
| 179 | x | BGP | |
| 443 | x | x | HTTPS |
| 465 | x | SMTPS (Secure Mail over SSL) | |
| 993 | x | x | IMAP (Secure IMAP over SSL) |
| 995 | x | x | POP3S (Secure POP3 over SSL) |
| 1645,1812 | x | RADIUS Authentication | |
| 1646,1813 | x | RADIUS Accounting |
Wednesday, December 21, 2011
Commonly Using Port Numbers
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