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Well-Known Port Lookup
Network & Ops · Free Online Tool
Look up IANA registered ports by port or service name.
By CoderNewbie Team
| Port | Protocol | Transport | Registrant | Description |
|---|---|---|---|---|
| 0 | Reserved | tcp,udp | IANA | Reserved port — do not use. |
| 5 | rje | tcp,udp | Jon Postel | Remote Job Entry. |
| 7 | echo | tcp,udp | Jon Postel | Echo protocol. |
| 9 | discard | tcp,udp | Jon Postel | Discard protocol. |
| 11 | systat | tcp,udp | Jon Postel | Active users. |
| 13 | daytime | tcp,udp | Jon Postel | Daytime protocol. |
| 17 | qotd | tcp,udp | Jon Postel | Quote of the Day. |
| 18 | msp | tcp,udp | Rina Nethaniel | Message Send Protocol. |
| 19 | chargen | tcp,udp | Jon Postel | Character Generator. |
| 20 | ftp-data | tcp | Jon Postel | File Transfer Protocol (data). |
| 21 | ftp | tcp | Jon Postel | File Transfer Protocol (control). |
| 22 | ssh | tcp | Tatu Ylonen | Secure Shell Protocol. |
| 23 | telnet | tcp | Jon Postel | Telnet protocol. |
| 25 | smtp | tcp | Jon Postel | Simple Mail Transfer Protocol. |
| 37 | time | tcp,udp | Jon Postel | Time protocol. |
| 42 | nameserver | tcp,udp | Jon Postel | Host Name Server. |
| 43 | nicname | tcp | Jon Postel | WHOIS protocol. |
| 49 | tacacs | tcp,udp | Cisco Systems | TACACS Access Protocol. |
| 53 | domain | tcp,udp | Paul Mockapetris | Domain Name System. |
| 67 | bootps | udp | Bill Croft | Bootstrap Protocol Server (DHCP). |
| 68 | bootpc | udp | Bill Croft | Bootstrap Protocol Client (DHCP). |
| 69 | tftp | udp | David Clark | Trivial File Transfer Protocol. |
| 70 | gopher | tcp | Mark McCahill | Gopher protocol. |
| 79 | finger | tcp | David Zimmerman | Finger protocol. |
| 80 | http | tcp | Jon Postel | Hypertext Transfer Protocol. |
| 88 | kerberos | tcp,udp | John Kohl | Kerberos authentication. |
| 102 | iso-tsap | tcp | Marshall Rose | ISO TSAP Class 0. |
| 107 | rtelnet | tcp | Joyce Reynolds | Remote Telnet Service. |
| 110 | pop3 | tcp | Marshall Rose | Post Office Protocol v3. |
| 111 | sunrpc | tcp,udp | Chuck McManis | ONC RPC (Sun RPC). |
| 113 | ident | tcp | Peter Eriksson | Authentication Service (identd). |
| 119 | nntp | tcp | Phil Lapsley | Network News Transfer Protocol. |
| 123 | ntp | udp | David Mills | Network Time Protocol. |
| 135 | epmap | tcp,udp | Microsoft | Microsoft RPC Endpoint Mapper. |
| 137 | netbios-ns | udp | Microsoft | NetBIOS Name Service. |
| 138 | netbios-dgm | udp | Microsoft | NetBIOS Datagram Service. |
| 139 | netbios-ssn | tcp | Microsoft | NetBIOS Session Service. |
| 143 | imap | tcp | Mark Crispin | Internet Message Access Protocol. |
| 161 | snmp | udp | Jeffrey Case | Simple Network Management Protocol. |
| 162 | snmptrap | udp | Jeffrey Case | SNMP Trap. |
| 179 | bgp | tcp | Kirk Lougheed | Border Gateway Protocol. |
| 194 | irc | tcp | Jarkko Oikarinen | Internet Relay Chat. |
| 389 | ldap | tcp,udp | Tim Howes | Lightweight Directory Access Protocol. |
| 443 | https | tcp | Kipp E.B. Hickman | HTTP over TLS. |
| 445 | microsoft-ds | tcp | Microsoft | Microsoft-DS (SMB). |
| 465 | submissions | tcp | Randy Gellens | SMTP over TLS (message submission). |
| 500 | isakmp | udp | IPsec WG | Internet Key Exchange (IKE). |
| 512 | exec | tcp | Mike Karels | Remote Process Execution. |
| 513 | login | tcp | Mike Karels | Remote Login (rlogin). |
| 514 | shell | tcp | Mike Karels | Remote Shell (rsh). |
| 514 | syslog | udp | Eric Allman | Syslog service. |
| 515 | printer | tcp | Lee Sieler | Line Printer Remote (LPD). |
| 520 | router | udp | Guy Almes | RIP (Routing Information Protocol). |
| 587 | submission | tcp | Randy Gellens | SMTP Message Submission. |
| 636 | ldaps | tcp | Tim Howes | LDAP over TLS. |
| 623 | asf-rmcp | udp | Amt-V | ASF Remote Management Control Protocol. |
| 631 | ipp | tcp | IPP WG | Internet Printing Protocol. |
| 639 | msdp | tcp | Bill Fenner | Multicast Source Discovery Protocol. |
| 646 | ldp | tcp | MPLS WG | Label Distribution Protocol. |
| 691 | msexch-routing | tcp | Microsoft | MS Exchange Routing. |
| 873 | rsync | tcp | Andrew Tridgell | rsync server. |
| 902 | vmware-auth | tcp | VMware | VMware Authentication Daemon. |
IANA Records
Reflects IANA Service Name and Transport Protocol Port Number Registry.
Multi-field Search
Search by port, protocol keyword, registrant, or description.
Transport Detail
Includes the transport (TCP, UDP, SCTP, DCCP) for each entry.
How to Use Well-Known Port Lookup
- 1Enter the URL, IP address, or network parameter to look up.
- 2Click the lookup or test button.
- 3Review the detailed results in the output panel.
- 4Use the information for your network operations.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Are network lookups real-time?
Yes, IP lookups, DNS queries, and HTTP tests perform live network requests to provide current data.
Is my IP address logged?
The IP Lookup tool queries public geolocation APIs. We do not store your IP address or lookup history.
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Learn the concept
Learn the concept
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