Open Port Checker Tool is useful for checking port in your router is open or close. This is online security tool check port open or being blocked in your firewall system. The open port checker is a tool you can use to check your external IP address and detect open ports on your connection.
Easy to use web-based port check service. Port check – Tests if port is opened on specified IP. Open Port Check Tool – Test Port Forwarding on Your Router. This test will tell you what standard services are running on your server and open to the world. Port Checker tool lets you find open ports in your system in an easy way. You can also test port forwarding with it.
Well known ports
20 & 21 – FTP (File Transfer Protocol)
22 – SSH (Secure Shell)
23 – Telnet, a Remote Login Service
25 – SMTP (Simple Mail Transfer Protocol)
53 – DNS (Domain Name System)
80 – HTTP (Hypertext Transfer Protocol)
110 – POP3 (Post Office Protocol 3)
115 – SFTP (Secure File Transfer Protocol)
123 – NTP (Network Time Protocol)
143 – IMAP (Internet Message Access Protocol)
161 – SNMP (Simple Network Management Protocol
194 – IRC (Internet Relay Chat)
443 – HTTPS (Hypertext Transfer Protocol Secure)
465 – SMTPS (Simple Mail Transfer Protocol over SSL)
554 – RTSP (Real Time Stream Control Protocol)
873 – RSYNC (RSYNC File Transfer Services)
993 – IMAPS (Internet Message Access Protocol over SSL)
995 – POP3S (Post Office Protocol 3 over SSL)
3389 – RDP (Remote Desktop Protocol)
5631 – PC Anywhere
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