Port Number Lookup
Search common TCP and UDP ports by number or service.
What runs on that port?
When you see an unfamiliar port in a log or firewall rule, a quick lookup saves a search. This tool maps the common well-known ports to their services, in both directions.
Search 443 and it returns HTTPS; search ssh and it returns port 22. The list covers the ports you meet day to day, from web and mail to databases and remote access.
Handy and private
The lookup runs against a built-in list in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
What can I search?
Type a port number to see its service, or a service name to find its port. It covers the widely used well-known ports.
Is this the full registry?
No. It is a curated list of the most common ports, not the complete IANA registry of every assignment.
TCP or UDP?
Each entry notes the protocol it commonly uses, though some services run on both.
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