Network Port Number Lookup and Service
Look up a network port number and its associated service (common ports reference), in your browser.
Well-known (0-1023) and common ports. Local reference, no network request.
🔒 100% client-side — no data sent
Look up a network port number to identify the service or protocol associated with it, based on a reference of common ports. Handy for troubleshooting, firewall configuration and system administration. The lookup runs 100% in your browser.
What is it for?
- ▸ Identify the service behind an open port
- ▸ Configure firewall rules with confidence
- ▸ Diagnose a network connection problem
- ▸ Review common ports (HTTP, HTTPS, SSH, FTP)
FAQ
Which port does HTTPS use?
HTTPS uses port 443 by default, while HTTP uses port 80. These ports are included in the tool's reference.
What is the difference between a TCP and a UDP port?
TCP establishes a reliable connection with acknowledgment, while UDP sends data without a prior connection. The same port number can be used by both protocols for different services.
What are the most common ports to know?
Among the most common are 22 (SSH), 80 (HTTP), 443 (HTTPS), 21 (FTP), 25 (SMTP) and 53 (DNS). The tool helps you quickly find their associated service.