40+ standard TCP/UDP ports — search by number, service, or keyword. Free, private, and runs entirely in your browser — no data leaves your device. Part of our Networking tools collection.
Tips
Range 0-1023 is 'well-known' per IANA; requires root to bind on Unix
Search by port number, service name, or any keyword in the notes
Many common dev ports are listed (3000, 5173, 11434)
FAQ
How do I use the Well-Known Ports?
Range 0-1023 is 'well-known' per IANA; requires root to bind on Unix Search by port number, service name, or any keyword in the notes Many common dev ports are listed (3000, 5173, 11434)
Is the Well-Known Ports free and private?
Yes — it runs in your browser, requires no signup for basic use, and your data never leaves your device. Port 22 (SSH) was registered by Tatu Ylönen in 1995 — he emailed IANA saying 'we'd like port 22' and they just... gave it to him.
