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Below is a table of frequently used TCP/UDP ports for communication over the Internet. To see which ports are currently open on your machine, drop to the command prompt and run "netstat -na" for a quick printout.
| Protocol | TCP | UDP |
|---|
| SSH | 22 | |
| FTP Data | 20 | |
| FTP | 21 | |
| Telnet | 23 | |
| SMTP | 25 | |
| DNS Client | 53 | 53 |
| DHCP Client | 67 | |
| DHCP Server | 68 | |
| TFTP | 69 | |
| HTTP | 80 | |
| POP3 | 110 | |
| NNTP | 119 | |
| IMAP | 143 | |
| LDAP | 389 | |
| HTTP SSL | 443 | |
| CIFS | 139,445 | 445 |
| IKE | | 500 | |
| NNTP SSL | 563 | |
| LDAP SSL | 636 | |
| IMAP SSL | 993 | |
| POP3 SSL | 995 | |
| MSSQL Session | 1433 | |
| Radius Accounting | | 1646, 1813 | |
| Radius Authentication | | 1645, 1812 | |
| L2TP | | 1701 | |
| PPTP | 1723 | |
| RDP | 3389 | |
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