Cmyport.com

What is open port checker?

An open port checker is a tool or utility used to determine which ports on a computer or network device are open and listening for connections. Ports are virtual points where network connections start and end.

They are associated with an IP address of the host as well as the type of protocol used for communication. The most common protocols are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).

When a port is open, it means that it is actively listening for incoming connections from other computers. This is necessary for various services and applications to function correctly, such as web servers (port 80 for HTTP, port 443 for HTTPS), email servers (port 25 for SMTP, port 110 for POP3, port 143 for IMAP), FTP servers (port 21), and many others.

What are ports?

ports allow software applications to share hardware resources without interfering with each other. Computers and routers automatically manage network traffic traveling via their virtual ports. There are 65,536 ports to choose from.

Ports 0 to 1023 - Well known port numbers. Only special companies like: MS SQL services (1433), Mail services POP3(110), IMAP(143), SMTP(25), Web services HTML(80).

Ports 1024 to 49151 - Registered ports; meaning they can be registered to specific protocols by software corporations.

Ports 49152 to 65536 - Dynamic or private ports; meaning that they can be used by just about anybody.

What is Port Forwarding?

Port Forwarding is a special function on the router, allowing transfer of data packets from the outside (from the Internet) to devices or computers on your local network (LAN). Usually the port on your router will be closed to prevent hackers on your system. But when you use the service to connect through port on the router you need to open it. For example: Yahoo! Messenger you need one of the following ports must be open: 5061, 443, 80.

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