Host port意思

"Host port" is a term commonly used in networking and refers to the port number associated with a specific host or device within a network. A port is a logical endpoint used in communications within a computer or between computers. It is a numerical value that identifies a specific process or service that is running on a host.

In the context of internet protocol (IP) addresses, a port is a 16-bit number that identifies an application or process that is receiving or sending data over the network. When data is sent from one device to another, it includes the IP address of the destination host and the port number of the application or process on that host that is intended to receive the data.

For example, when you browse the web, your web browser typically uses port 80 for HTTP (Hypertext Transfer Protocol) and port 443 for HTTPS (Hypertext Transfer Protocol Secure) to communicate with web servers. When you send an email, your email client might use port 25 for SMTP (Simple Mail Transfer Protocol) to send emails and port 110 for POP3 (Post Office Protocol version 3) or port 995 for POP3 over SSL (Secure Sockets Layer) to receive emails.

In summary, the host port is the combination of the host's IP address and the port number that identifies a specific service or application running on that host. It is used to direct network traffic to the correct application or process on the host device.