ToolsFaction Online Tool
TCP & UDP Port Number Lookup
Check common port references and port number ranges.
Look up common TCP and UDP port numbers and identify well-known, registered or dynamic port ranges.
About This Tool
ToolsFaction Port Number Lookup is a quick reference for frequently encountered network ports and IANA-style port ranges. A port number does not guarantee which application is actually listening on a system.
How to Use
- Enter a port number from 0 to 65535.
- Select Look Up Port.
- Review its range classification.
- Check the common service reference when available.
Example
Look up port 443 to see its common HTTPS association and port range.
Frequently Asked Questions
Does a port number prove which service is running?
No. Applications can be configured to use nonstandard ports.
What are well-known ports?
Ports 0 through 1023 are commonly described as the well-known range.
Does this scan remote hosts?
No. It is a local reference tool.
Are both TCP and UDP possible?
Protocol usage depends on the service; the compact lookup is a common-reference aid rather than a live protocol scan.
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Browser-BasedNothing to install
Privacy FriendlyBuilt for simple use