How to Use the TCP & UDP Common Ports Directory
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Search by port number (e.g. 22, 53, 3389, 5432) or service name (e.g. "ssh", "dns", "redis", "minecraft").
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Filter by protocol (TCP, UDP, or Both) and port range (Well-Known 0–1023, Registered 1024–49151).
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Review service description, default encryption, and security considerations.
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Copy firewall rule templates with 1 click.
Practical Example & Use Case
Common Real-World Scenario
Looking up port 3306 to verify it corresponds to default MySQL/MariaDB database traffic when configuring AWS security group rules.
Technical Notes & Limitations
Browser Engine Architecture
Contains verified IANA port numbers and popular modern application standards.
Frequently Asked Questions
What is the highest valid port number?
65,535. Port numbers are 16-bit unsigned integers ranging from 0 to 65535.