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Port checking networking tools are free utilities for remotely verifying if a port is open or closed on a specific IP address. Though administering a port check, internet port closings can be located to diagnose port connection issues. Commonly checked ports include FTP, SSH, Telnet, SMTP, DNS, HTTP, POP3, and IMAP. It is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports. Port forwarding or port mapping allows remote computers to connect to a specific computer or service on a private network. Port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall. This technique is most commonly used to make services on a host residing on a protected or masqueraded (internal) network available to hosts on the opposite side of the gateway (external network), by remapping the destination IP address and port number of the communication to an internal host. This allows anyone to run a web server, game server or a service of choice from behind a router. In a typical network the router has the public IP address and computers/servers obtain a private IP address from the router that is not addressable from outside the network. When you forward a specific port on your router, you are telling your router where to direct traffic for that port. This utility can verify the success of that process. Most residential ISPs block ports to combat viruses and spam. The most commonly blocked ports are port 80 and port 25. Port 80 is the default port for http traffic. With blocked port 80 you will need to run your web server on a non-standard port.Port 25 is the default sending and receiving mail port. ISPs often block this port to reduce the amount of spam generated by worms on infected machines within their network. Port checker utility tools often test various ports while others check specific ones. They are categorized online with other networking tools like Ping, Traceroute, DNS lookup, Proxy Checker, etc.