Welcome to the Port Check Tool.

Let this tool help you check your ports! Want to know if your server is running? Now you can! Simply enter what port you want to verify into the empty box and click, "Check Your Port". A message will appear, notifying you if your port is blocked by a firewall or ISP.

Your Current Public IP Address is:

Common Ports
FTP 21
SSH 22
Telnet 23
Web 80
Pop 3 110
IMAP 143
Other Applications
Remote Desktop 3389
PC Anywhere 5631
Full Port List

Did You Know?

  • Port 25 is the standard port which mail servers listen on. Many ISP's block inbound and outbound port 25 to stop spammers from abusing their networks. This makes running a mail server on one of these ISP's networks nearly impossible.
  • Port 80 is the standard port which web(http) servers run on. Many ISP's have blocked port 80 to stop viruses such as Nimda from slowing down their networks and infecting their customers' computers.
  • If you are having problems with your ISP blocking ports including port 25 and port 80, visit noip.com for a solution. For more information on ports, including port forwarding guides for most common routers, go to No-IP's Knowledge Base.

Port Check Tool is a free tool provided by NoIP.com.

Free Dynamic DNS - Port Check Tool