Free utility to check the port status of a given hostname or IP address
About Open Port Checker
The open port check tool can help you to find out whether a web server is open to external Internet on a specific port, or find out whether your server's port forwarding rules are setup correctly.
Port Service
21 FTP (File TransportToLink Protocol) - file storage and retrieval
22 SSH, SFTP - secure shell and SSH based FTP
23 Telnet - non-secure shell
25 SMTP (Simple Mail Transfer Protocol) - sending and receiving email messages
53 DNS (Domain Name System) - mapping from hostname to ip and vice versa
80 HTTP (HyperText Transfer Protocol) - main protocol of world wide web
443 HTTPS - TLS/SSL (Transport Layer Security)
143 IMAP (Internet Message Access Protocol) - mail retrieval protocol
3306 MySQL database
3389 RDP - Remote Desktop
1433 MSSQL database
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Note: We do not save any of the information derived from the use of these tools.