Common ports and typical services (not exhaustive).
| Port | Protocol | Service |
|---|---|---|
| 20 | TCP | FTP data |
| 21 | TCP | FTP control |
| 22 | TCP | SSH |
| 23 | TCP | Telnet |
| 25 | TCP | SMTP |
| 53 | TCP/UDP | DNS |
| 67 | UDP | DHCP server |
| 68 | UDP | DHCP client |
| 69 | UDP | TFTP |
| 80 | TCP | HTTP |
| 110 | TCP | POP3 |
| 123 | UDP | NTP |
| 135 | TCP/UDP | MS RPC |
| 137 | UDP | NetBIOS name |
| 138 | UDP | NetBIOS datagram |
| 139 | TCP | NetBIOS session |
| 143 | TCP | IMAP |
| 161 | UDP | SNMP |
| 162 | UDP | SNMP trap |
| 389 | TCP/UDP | LDAP |
| 443 | TCP | HTTPS |
| 445 | TCP | SMB |
| 465 | TCP | SMTPS (legacy) |
| 514 | UDP | Syslog |
| 587 | TCP | SMTP submission |
| 636 | TCP/UDP | LDAPS |
| 853 | TCP/UDP | DNS over TLS |
| 993 | TCP | IMAPS |
| 995 | TCP | POP3S |
| 1433 | TCP | Microsoft SQL |
| 1521 | TCP | Oracle DB |
| 2049 | TCP/UDP | NFS |
| 2082 | TCP | cPanel HTTP |
| 2083 | TCP | cPanel HTTPS |
| 3306 | TCP | MySQL/MariaDB |
| 3389 | TCP | RDP |
| 5432 | TCP | PostgreSQL |
| 5900 | TCP | VNC |
| 6379 | TCP | Redis |
| 8080 | TCP | HTTP proxy / alt HTTP |
| 8443 | TCP | HTTPS alt / dev |
| 9200 | TCP | Elasticsearch HTTP |
| 27017 | TCP | MongoDB |