Port Number Lookup
Enter any port number (0–65535) to see the standard service name, TCP/UDP protocol, and what it is used for.
100% client-side · no upload
Service
Protocol
Description
Port is not in the well-known ports list. It may be used by a private application or service.
How to use
- Enter any port number between 0 and 65535.
- Click Look up port to see the standard service, protocol, and description.
- Use this to identify open ports on a server, troubleshoot firewall rules, or understand network scan results.
Port number ranges
- 0–1023 — Well-known ports. Reserved for system services (HTTP=80, HTTPS=443, SSH=22, DNS=53).
- 1024–49151 — Registered ports. Assigned by IANA to specific applications (MySQL=3306, PostgreSQL=5432, Redis=6379).
- 49152–65535 — Dynamic/private ports. Used temporarily by client applications for outgoing connections.
Related network tools
- HTTP Headers Decoder — parse raw HTTP request/response headers
- SSL/TLS Grade Info — understand SSL Labs grade criteria
- IP / CIDR Calculator — compute subnet details from CIDR notation
常见问题
- Is this port lookup free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. The port database is embedded in the page and all lookups run locally in JavaScript.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.