Common network ports
Well-known TCP and UDP port numbers.
Common network ports
| Port | Protocol | Service | What it is for |
|---|---|---|---|
| 20 | TCP | FTP data | Active-mode file transfer data |
| 21 | TCP | FTP | File transfer control, unencrypted |
| 22 | TCP | SSH | Secure shell; also SFTP and SCP |
| 23 | TCP | Telnet | Remote login, unencrypted: avoid |
| 25 | TCP | SMTP | Mail between servers |
| 53 | TCP/UDP | DNS | Name lookups (TCP for large answers and zone transfers) |
| 67 | UDP | DHCP server | Hands out addresses |
| 68 | UDP | DHCP client | Receives addresses |
| 69 | UDP | TFTP | Trivial file transfer, as for network boot |
| 80 | TCP | HTTP | Web, unencrypted |
| 88 | TCP/UDP | Kerberos | Authentication, as in Active Directory |
| 110 | TCP | POP3 | Fetching mail, unencrypted |
| 119 | TCP | NNTP | Usenet news |
| 123 | UDP | NTP | Time sync |
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