Check if TCP port is open or closed

This tool is used to check to see if a network port is open or a certain port is currenly blocked by firewall. For example, you can check port 80 on the IP address of your server to make sure that you installed and configured your web server correctly.

The following is the list of common ports:

21-FTP, 22-SSH, 23-TELNET, 25-SMTP, 80-HTTP, 110-POP3, 115-SFTP, 135-RPC, 143-IMAP, 194-IRC, 443-SSL, 1433-MSSQL, 3306-MySQL, 3389-Remote Desktop