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In this example, the number 8100 refers to the port number used by the browser to connect to the web
server. The standard port number used by web sites is 80, so this number does not need to be included
with the URL (although it can be). In IP networking, port numbers can theoretically range from 0 to 65535.
Most popular network applications, though, use port numbers at the lower end of the range (such as 80 for
HTTP). Ports are similar to doors and windows of your house, with port 80 acting as the front door. If these
are not open you could not enter the house. This is the same case with ports on a network. If the ports for a
specific IP address are not open then you could not gain access to that IP address.
Note: The term port also refers to several other aspects of network technology. A port can refer to
Ethernet connection points, such as those on a hub, switch, or router. The term port is also used to
refer to a physical connection point for peripheral devices such as serial, parallel, and USB ports.
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ERS-4 Instruction Manual
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