What is a port?


A port is a place to connect to another computer or device. Ports can be physical or logical.

A port in GlassWire usually means an Internet port which is a logical port used to make connections on the Internet.

A logical connection can be made without any physical changes.

About Internet ports

Knowing the Internet port number usually means that the protocol is known because ports are reserved for specific purposes. For example, email is on port 25 and web pages are on port 80.

The port number is part of the socket which is a combination of the IP address and port number. So if you change the port number that GlassWire uses then your GlassWire remote connections will have to be told the socket. You might have to do this if another program is using the GlassWire’s default port.

About physical ports

In hardware (physical devices), a physical port is an interface to connect to another device, There is usually a physical plug and a physical socket or port.

Examples of physical ports are a serial port, a parallel port, a USB port, a SCSI port or a printer port.

It is usual for physical ports to have more than one name such as some common names and more technical names. So a printer port could be a USB port, a USBType-B port or a USB 2.0 Type-B port and so on.

Many cables are based on published standards so an example is a Firewire cable which is based on the IEEE 1394 standard - in practise either terms can be used.

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What is a custom port?