Port Reference Tool
NewLook up well-known TCP/UDP port numbers and their associated services. Find the service name, protocol (TCP/UDP), and security notes for any port from 1 to 65535. Includes all IANA-registered ports: HTTP (80), HTTPS (443), SSH (22), FTP (21), SMTP (25), DNS (53), and hundreds more. Useful for firewall configuration, network documentation, security auditing, and learning networking fundamentals.
Port Reference Tool
Look up well-known ports, service names, and security risk levels. Helps identify potentially dangerous open ports.
How to Use Port Reference Tool
- 1Enter a port number
- 2View the associated service and protocol
- 3Search by service name
- 4Browse commonly used ports
About Port Reference Tool
Look up well-known TCP/UDP port numbers and their associated services. Find the service name, protocol (TCP/UDP), and security notes for any port from 1 to 65535. Includes all IANA-registered ports: HTTP (80), HTTPS (443), SSH (22), FTP (21), SMTP (25), DNS (53), and hundreds more. Useful for firewall configuration, network documentation, security auditing, and learning networking fundamentals.
Your Privacy is Protected
Port Reference Tool runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Why are ports 0-1023 called well-known ports?
IANA assigns ports 0–1023 to well-known services. These require root/admin privileges on most OSes. Ports 1024–49151 are registered, and 49152–65535 are ephemeral/dynamic.
Why Use This Tool?
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