Port Checker & Reference

Reference guide for common network ports and their purposes. Note: Browser security prevents direct port scanning from web pages.

Browser Limitations

Due to browser security restrictions, direct port scanning cannot be performed from a web page. This tool provides a reference guide for common ports. For actual port checking, use command-line tools like telnet, nc (netcat), or online port checker services.

Port Information Lookup

Common Network Ports Reference

Port	Service	Protocol	Description
20	FTP Data	TCP	File Transfer Protocol data transfer
21	FTP Control	TCP	File Transfer Protocol control
22	SSH	TCP	Secure Shell remote login
23	Telnet	TCP	Telnet remote login
25	SMTP	TCP	Simple Mail Transfer Protocol
53	DNS	TCP/UDP	Domain Name System
80	HTTP	TCP	Hypertext Transfer Protocol
110	POP3	TCP	Post Office Protocol version 3
143	IMAP	TCP	Internet Message Access Protocol
443	HTTPS	TCP	HTTP Secure (SSL/TLS)
465	SMTPS	TCP	SMTP over SSL
587	SMTP Submission	TCP	SMTP message submission
993	IMAPS	TCP	IMAP over SSL
995	POP3S	TCP	POP3 over SSL
3306	MySQL	TCP	MySQL database server
3389	RDP	TCP	Remote Desktop Protocol
5432	PostgreSQL	TCP	PostgreSQL database server
8080	HTTP Alt	TCP	Alternative HTTP port
8443	HTTPS Alt	TCP	Alternative HTTPS port

How to Check Ports (Command Line)

Using Telnet:

telnet example.com 80

Using Netcat (nc):

nc -zv example.com 80

Using PowerShell (Windows):

Test-NetConnection -ComputerName example.com -Port 80

About Port Checker & Reference

This is a free, fast, and fully client-side port checker & reference tool. All processing is done locally within your browser to ensure maximum privacy and security. No data is sent to our servers. Bookmark this page for quick access to ad-free, high-performance SEO and developer utilities.