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Strange things in URL's

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3 replies

by rmg

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I keep seeing URL's that look like this:

http://www-923.ibm.com

Sites will have a - after the www and some numbers. What does this mean? What does it do? And how is it setup? Just curious....Thanks in advance!

3 replies

by alveden

It's just a DNS name www-923.ibm.com. It is set up using a DNS server, where you can map names like, www.ibm.com or www-923.ibm.com .. to an ip address.

All internet base computer still communicate through ip address .. which is a number like 192.168.1.1. However for human, it is easier to remember words, rather then number. Hence, that's what DNS is for.

Another application for DNS is to support virtual site. For example nowadays, a single web server can host thousands of site each withdifferent url. So you can use DNS server to map different name to a single ip address.

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