Free tool · Reference
Common Port Reference
Searchable list of well-known TCP/UDP ports and protocols.
| Port | Proto | Service | Description |
|---|---|---|---|
| 20 | TCP | FTP-DATA | File Transfer Protocol (data) |
| 21 | TCP | FTP | File Transfer Protocol (control) |
| 22 | TCP | SSH | Secure Shell / SFTP / SCP |
| 23 | TCP | Telnet | Unencrypted remote login |
| 25 | TCP | SMTP | Mail transfer |
| 49 | TCP/UDP | TACACS+ | AAA (Cisco) |
| 53 | TCP/UDP | DNS | Domain Name System |
| 67 | UDP | DHCP | DHCP server / BOOTP |
| 68 | UDP | DHCP | DHCP client |
| 69 | UDP | TFTP | Trivial File Transfer |
| 80 | TCP | HTTP | Web (cleartext) |
| 88 | TCP/UDP | Kerberos | Authentication |
| 110 | TCP | POP3 | Mail retrieval |
| 123 | UDP | NTP | Network Time Protocol |
| 135 | TCP | MS-RPC | Microsoft RPC endpoint mapper |
| 137 | UDP | NetBIOS-NS | NetBIOS name service |
| 138 | UDP | NetBIOS-DGM | NetBIOS datagram |
| 139 | TCP | NetBIOS-SSN | NetBIOS session |
| 143 | TCP | IMAP | Mail retrieval |
| 161 | UDP | SNMP | Network management |
| 162 | UDP | SNMP-Trap | SNMP traps |
| 179 | TCP | BGP | Border Gateway Protocol |
| 389 | TCP/UDP | LDAP | Directory access |
| 443 | TCP | HTTPS | Web (TLS) |
| 445 | TCP | SMB | Microsoft file sharing |
| 465 | TCP | SMTPS | Mail submission (TLS) |
| 500 | UDP | IKE | IPsec key exchange (ISAKMP) |
| 514 | UDP | Syslog | System logging |
| 515 | TCP | LPD | Line printer daemon |
| 520 | UDP | RIP | Routing Information Protocol |
| 546 | UDP | DHCPv6 | DHCPv6 client |
| 547 | UDP | DHCPv6 | DHCPv6 server |
| 587 | TCP | SMTP | Mail submission (STARTTLS) |
| 636 | TCP | LDAPS | Directory access (TLS) |
| 646 | TCP/UDP | LDP | MPLS Label Distribution |
| 993 | TCP | IMAPS | IMAP over TLS |
| 995 | TCP | POP3S | POP3 over TLS |
| 1812 | UDP | RADIUS | AAA authentication |
| 1813 | UDP | RADIUS | AAA accounting |
| 1985 | UDP | HSRP | Hot Standby Router Protocol |
| 2055 | UDP | NetFlow | Flow export (common) |
| 3128 | TCP | Squid | Proxy |
| 3389 | TCP | RDP | Remote Desktop |
| 4500 | UDP | IPsec NAT-T | IKE / ESP over NAT |
| 5060 | TCP/UDP | SIP | VoIP signaling |
| 5061 | TCP | SIP-TLS | VoIP signaling (TLS) |
| 6343 | UDP | sFlow | Flow sampling |
| 8080 | TCP | HTTP-alt | Web / proxy (alt) |
| 8443 | TCP | HTTPS-alt | Web (TLS, alt) / mgmt |
About this tool
Free TCP/UDP port reference. Search well-known and registered ports by number, protocol or service name — the ports network and security engineers look up every day. Everything runs entirely in your browser — nothing you type is sent to a server.
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