TOOL
Port Lookup
Search the IANA port registry by number (443) or service name (https). Detailed records link straight through.
Processing happens locally in your browser. Nothing you type is sent to BlackhawkHub.
Data from the IANA Service Name and Transport Protocol Port Number Registry, loaded into your browser.
How to use it
Type a port number to see the TCP and UDP services registered for it, or type a service name to find its port. Results link to BlackhawkHub's detailed record where one exists.
Registration versus reality
The IANA registry is the authoritative list of port assignments, but registration is a coordination exercise, not enforcement: any program can use any free port. Some heavily used ports were never registered for their real purpose, and some registered names (8443, 3000, 1521) differ from actual use. The port number ranges record explains the system.
To see what is listening on your own machine, use netstat; this tool identifies what a port is for, not what is using it locally.
Frequently asked questions
Where does the port data come from?
The IANA Service Name and Transport Protocol Port Number Registry, the authoritative assignment list, loaded as a static file into your browser. BlackhawkHub's own detailed records are linked where they exist.
Why does a port show a service I do not expect?
The registry records the assigned service, which is not always what actually runs there. Ports like 8080, 8443, 3000 and 1521 are used by convention for things other than their registration. The detailed records explain these cases.