How to Use the Network Port Lookup & Protocol Reference
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Type any port number (e.g. 443, 22, 3306, 8080) or service keyword (e.g. SSH, MySQL, HTTPS, Redis, DNS) into the search box.
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Filter by protocol category: Well-Known (0-1023), Registered (1024-49151), or Dynamic/Private (49152-65535).
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Select TCP, UDP, or Both to narrow down protocol matches.
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Click any port row to view in-depth details: Description, Official RFC number, Security Risk Level, and Firewall Hardening advice.
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Copy port configuration details with a single click.
Practical Example & Use Case
Common Real-World Scenario
Quickly verifying whether an open port discovered during a security vulnerability scan (e.g., port 5432 or 6379) belongs to a database that should never be exposed to the public internet.
Technical Notes & Limitations
Browser Engine Architecture
Comprehensive offline dataset of 300+ most widely encountered production ports according to IANA registry specifications.
Frequently Asked Questions
What are the three port number ranges?
System/Well-Known ports (0-1023) reserved for privileged core services; User/Registered ports (1024-49151) for registered vendor applications; and Dynamic/Private ports (49152-65535) used for ephemeral client connections.