How to decrease the URL size

Hello,
I have the URL which has a big server name which like http://jajd.kdkf.dkfek.kejfie.com
(just an example) . If I need to go the server in LAN then I need to give total address. Is there any way to reduce the URL by any means?

And how do we get the url names google.com and yahoo.com etc?
Please reply