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Network Port Database
Look up any port number to find its service, protocol, and security information
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What Are Network Ports?
Network ports are virtual endpoints that enable communication between devices on a network. Every network connection uses a combination of an IP address and a port number to route data to the correct application or service. Ports are identified by numbers ranging from 0 to 65535, and they play a critical role in how computers, servers, and network devices exchange information.
When you browse a website, your browser connects to port 80 (HTTP) or port 443 (HTTPS) on the web server. When you send an email, your email client connects to port 25 (SMTP) or port 587 (SMTP Submission). Each service listens on a specific port, allowing multiple services to run simultaneously on a single server.
Understanding which ports are open on your network is essential for security. Open ports can provide entry points for attackers if the services behind them are misconfigured or vulnerable. Regular port scanning and monitoring helps identify potential security risks before they can be exploited.
Port Ranges Explained
The Internet Assigned Numbers Authority (IANA) divides the 65,536 available port numbers into three distinct ranges, each serving a different purpose:
Well-Known Ports
0 – 1023Reserved for widely-used system services and protocols. These are assigned by IANA and typically require root/administrator privileges to bind. Examples include HTTP (80), HTTPS (443), SSH (22), DNS (53), and SMTP (25).
Registered Ports
1024 – 49151Used by software applications and services registered with IANA. These don't require special privileges. Examples include MySQL (3306), PostgreSQL (5432), RDP (3389), and MongoDB (27017).
Dynamic / Ephemeral Ports
49152 – 65535Temporarily assigned by the operating system for client-side connections. When your browser connects to a web server, it uses a random ephemeral port as the source. These are never permanently assigned to any service.