Port Checker
Reference guide for common network ports with typical services and security notes.
Network ports are numbered endpoints for network communication. Knowing which services run on which ports is essential for network administration, security auditing, and firewall configuration. This tool provides a reference for common port assignments.
Note: Active port scanning (checking if a port is open on a remote host) cannot be done from a browser due to security restrictions. This tool provides port reference information. Use tools like nmap or netcat for active scanning.
Note: Active port scanning (checking if a port is open on a remote host) cannot be done from a browser due to security restrictions. This tool provides port reference information. Use tools like nmap or netcat for active scanning.
Checker
Results
—
—
—
—
—
How to Use
- Enter a port number (1-65535)
- Click Calculate to look up the port
- See the common service, protocol, and security notes
FAQ
Can this tool scan if a port is open?
No. Browsers cannot perform port scanning for security reasons. This is a reference tool. Use nmap or telnet for active port scanning.
What is the difference between TCP and UDP?
TCP provides reliable, ordered delivery of data. UDP provides faster, connectionless delivery without guarantees. Most web services use TCP.
Is my data safe when I use Port Checker?
Yes. All calculations run entirely in your browser. Your data is never sent to a server, stored in a database, or shared with anyone. You can use this tool with complete confidence that your information remains private.
Part of These Collections
Curated tool sets for specific workflows
Thank you! Your report has been submitted.