Search 40 well-known TCP/UDP port numbers and their services
Random Port Generator
Runs locally
Use Random Port Generator
What it does
Pick random port numbers for a development server, a test container or a firewall rule, inside a range you choose.
It runs entirely in your browser: nothing you enter is uploaded.
Example
IANA dynamic range
4915254106, 60068, 60314, 58736, 60373Five distinct ports between 49152 and 65535, the range IANA sets aside for dynamic and private use.
FAQ
Does it check whether a port is free?
No. A web page cannot see which ports are open on your machine, so the numbers are only random picks. Check with ss -ltn on Linux, lsof -i -P on macOS or netstat -ano on Windows before you bind one.
Which range should I use?
Ports below 1024 are well-known service ports, and on Linux binding to them needs root or a special capability, so the default skips them. 49152–65535 is the IANA dynamic and private range with no registered services, but operating systems also take outgoing ports from high ranges (Linux: 32768–60999), so check that the port is free.
Is anything sent or scanned?
No. The numbers come from crypto.getRandomValues in your browser; no port is probed and nothing is uploaded.