Common Port Assignments

If you have S at the end of a name and the S means secure that means we got it from 'SSL'.

If you have S at the end of a name and the S means secure that means we got it from 'SSL'.

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The port numbers make Network Address Translation (NAT) work.

A number of places where knowledge of port numbers is critical to protect your network, to make routers work better, and to address a zillion other issues.

Clients normally do not care about the value of the ephemeral port; the client just needs to be certain that the ephemeral port is unique on the client host.

The transport protocol code guarantees this uniqueness.

In its simplest form, where neither endpoint is multihomed, this results in the same four-tuple socket pair used with TCP.

However, when either of the endpoints of an association are multihomed, then multiple four-tuple sets (with different IP addresses but the same port numbers) may identify the same association.

There is no such thing as a network administrator who isn't deeply into the magic of port numbers and who cannot manipulate them for his or her network's needs.

You know that every TCP/IP application requires a server and a client.

Tip TCP/IP port numbers between are the well-known port numbers. When a Web client (let's say your computer running Firefox) sends an HTTP ACK to a Web server to request the Web page. The computer running the Web server reads the destination port number, telling it to send the incoming packet to the Web server program.

The Web client's source port number is generated pseudo-randomly by the Web client computer.