The open port check tool checks if a particular port is open in your computer. Use the Open port check tool if you’re setting up servers and want to check if the servers are accessible through the internet, or to check if port forwarding is setup correctly and firewall rules are configured properly. You can also use the open port check tool to ensure vulnerable ports are not open to the public. A list of commonly used ports are listed here for reference
| Service | Port No. |
|---|---|
| FTP Server | 21 |
| Secure Shell(SSH) | 22 |
| Telnet | 23 |
| SMTP | 25 |
| DNS | 53 |
| Web Server | 80 |
| POP3 | 110 |
| IMAP | 143 |
| Web Server (HTTPS) | 443 |
| Remote Desktop | 3389 |
| Teamviewer | 5938 |
IPv4 addresses (eg. 166.78.3.89) IPv6 addresses (eg. 2001:4800:7810:512:48c0:bad5:ff04:8177) and domain names (eg. websistent.com) are accepted. Private and reserved IPv4 and IPv6 ranges are not accepted.
Read the PHP Open Port Check Script to find out how I designed this tool.
