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Port Number Lookup
Search well-known TCP and UDP ports to see the service, the protocol and a short security note.
Look up a port
Entries shown: 0
Selected port: none
How to use the Port Number Lookup
- Type a port number, a service name or a keyword into the search box.
- Filter by TCP or UDP if you already know which protocol you need.
- Read the service name and the security note, then confirm the port on your own host.
Features
- Dozens of well-known TCP and UDP ports
- Search by number, service name or keyword
- Protocol filter for TCP, UDP or both
- Short security note for every entry
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Frequently Asked Questions
Common questions about the free online port number lookup.
A port number is a 16-bit value that identifies which service on a host should receive a
network connection or datagram.
Type the number, a service name or a keyword into the search box and the matching rows appear
immediately.
TCP is connection oriented and reliable, while UDP is connectionless and faster, and the two
use separate port spaces.
Ports below 1024 are the well-known range, registered ports run from 1024 to 49151, and the
rest are dynamic.
Services such as DNS and NTP answer on TCP and UDP, so the entry shows both to save you a
second lookup.
Only when the service is required and hardened. Most administration and database ports belong
on a private network instead.
Run your operating system's socket listing command on the host itself, since this page
cannot see your machine.
Services such as Redis, Elasticsearch and Memcached often run on high ports and are
frequently left wide open.
No. The table is built into the page and every filter runs locally in your browser, so
nothing is logged or uploaded.
Yes. It is free and unlimited, needs no account, and works on both desktop and mobile
browsers.
Last updated: October 10, 2026