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:

Your result can be seen below.


No results.

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
21FTP File Transfer Protocol - File Transfer Protocol. Port for commands.
22SSHSecure SHell - "secure shell". Remote Management Protocol operating system.
23telnetTErminaL NETwork. Protocol implementation text interface over the network.
25SMTPSimple Mail Transfer Protocol.
43WHOIS"Who is". Protocol obtaining the registration of ownership of domain names and IP addresses
53DNSDomain Name System.
67DHCPDynamic Host Configuration Protocol. Dynamic IP
69TFTPTrivial File Transfer Protocol - a simple file transfer protocol.
80HTTP / WebHyperText Transfer Protocol.
110POP3Post Office Protocol Version 3 - receive e-mail protocol, version 3
115SFTPSSH File Transfer Protocol. Secure data transmission protocol.
143IMAPInternet Message Access Protocol. Application-level protocol for accessing e-mail.
161SNMPSimple Network Management Protocol. Device Management.
443HTTPSHyperText Transfer Protocol Secure) - protocol HTTP, which supports encryption.
515LPDLine Printer Daemon. Remote printing protocol on the printer.
993IMAP SSLProtocol IMAP, supports SSL encryption.
995POP3 SSLPOP3 protocol supports SSL encryption.
1080SOCKSSOCKet Secure. Receiving protocol secure anonymous access.
3128ProxyCurrently the port often used proxies.
3389RDPRemote Desktop Protocol - Remote Desktop for Windows.
5900VNCVirtual Network Computing - a system of remote access to the desktop computer.
5938TeamViewerTeamViewer - Remote control system for ensuring your computer and data exchange.
8080HTTP / WebAlternate port for the HTTP protocol. Sometimes used proxies.

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