What Is Port Number Reference?

A free online port number reference guide covering the most commonly used TCP and UDP ports. Browse well-known ports (0-1023), registered ports (1024-49151), and dynamic/private ports (49152-65535). Search by port number, service name, or keyword. Each entry shows the port number, protocol (TCP/UDP), standardized service name, and a clear description of its purpose. Categories include web (HTTP/HTTPS), email (SMTP/IMAP/POP3), database (MySQL/PostgreSQL/MongoDB/Redis), remote access (SSH/RDP/VNC), security (VPN/TLS), and development (Docker/Kubernetes/Git). Includes a port range reference section for quick orientation.

Why Use Port Number Reference?

  • 40+ commonly used ports with descriptions
  • Search by port number, service name, or keyword
  • Port range reference (well-known, registered, dynamic)
  • Icons grouped by category (web, email, database, security)
  • One-click copy of any port number

How to Use Port Number Reference — Step by Step

1

Browse the port list or use the search bar.

2

Filter by port number, service name, or description.

3

Review protocol, service, and usage details.

4

Click Copy on any port to copy its number.

Who Is Port Number Reference Best For?

  • firewall configuration
  • network security auditing
  • software development
  • system administration

Port Number Reference — Frequently Asked Questions

What is the difference between TCP and UDP?

TCP is connection-oriented with guaranteed delivery — used for web, email, and file transfer. UDP is connectionless with no delivery guarantee — used for DNS, streaming, and real-time applications where speed matters more than reliability.

Why are some ports considered "well-known"?

Well-known ports (0-1023) are assigned by IANA to widely used services. Binding to these ports typically requires root/admin privileges. Examples include HTTP (80), HTTPS (443), and SSH (22).

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