Open Port Checker
Form of Open Port Checker
With this tool you can check if a port is open or not. Enter a hostname or an IP address and comma separated ports to check those ports status:
About Port Checker
What is Port Checker?
The Open Port Checker is a free tool you can use to check your external IP address(not internal) and detect open ports on your connection. This tool is helpful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall or something else. The Port Checker tool also can be used as a port scanner to scan your network for ports that are commonly forwarded. It is important to note that some ports, such as port 25, are often blocked at the ISP level in an attempt to prevent malicious activity.
How it Works?
Just paste your Host or IP and entered some of Ports to the inputs above and click to the button "Check" and you will be informed about whether the ports are open or not.
Attention: Timeout is set to 3 seconds per port. Maximum count of ports in the one request is 15.
Some of default ports
Port numbers ranges from 1 to 65535
- 0-1023 - Well known ports (HTTP, SMTP, DHCP, FTP etc)
- 1024-49151 - Reserved Ports
- 49152-65535 - Dynamic/Private Ports
|21||FTP||File Transfer Protocol - File Transfer Protocol. Port for commands.|
|22||SSH||Secure SHell - "secure shell". Remote Management Protocol operating system.|
|23||telnet||TErminaL NETwork. Protocol implementation text interface over the network.|
|25||SMTP||Simple Mail Transfer Protocol.|
|43||WHOIS||"Who is". Protocol obtaining the registration of ownership of domain names and IP addresses|
|53||DNS||Domain Name System.|
|67||DHCP||Dynamic Host Configuration Protocol. Dynamic IP|
|69||TFTP||Trivial File Transfer Protocol - a simple file transfer protocol.|
|80||HTTP / Web||HyperText Transfer Protocol.|
|110||POP3||Post Office Protocol Version 3 - receive e-mail protocol, version 3|
|115||SFTP||SSH File Transfer Protocol. Secure data transmission protocol.|
|143||IMAP||Internet Message Access Protocol. Application-level protocol for accessing e-mail.|
|161||SNMP||Simple Network Management Protocol. Device Management.|
|443||HTTPS||HyperText Transfer Protocol Secure) - protocol HTTP, which supports encryption.|
|515||LPD||Line Printer Daemon. Remote printing protocol on the printer.|
|993||IMAP SSL||Protocol IMAP, supports SSL encryption.|
|995||POP3 SSL||POP3 protocol supports SSL encryption.|
|1080||SOCKS||SOCKet Secure. Receiving protocol secure anonymous access.|
|3128||Proxy||Currently the port often used proxies.|
|3389||RDP||Remote Desktop Protocol - Remote Desktop for Windows.|
|5900||VNC||Virtual Network Computing - a system of remote access to the desktop computer.|
|5938||TeamViewer||TeamViewer - Remote control system for ensuring your computer and data exchange.|
|8080||HTTP / Web||Alternate port for the HTTP protocol. Sometimes used proxies.|
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