Cable modem win2k or linux or solaris or bsd or playstation

[SERVERTROUBLE]

Hello good people, Can someone tell me how I can route 5 
diffrent domain names i.e (www.domain.com) to one static IP 
addresse and have the server automaticaly know wich website the 
person is looking for. To be mosre specific I have a time 
warner cable connection and i currently have 5 websites that i 
host with other companies I want to transfer those sites to my 
local server here and host them myself. The problem is i only 
have one IP and 5 websites. I can run just about any Operating 
system on the server linux to windows 200 server. What do i 
need to do?  Can a server be a dns server and a webserver at 
the same time if each site is only seeing about 20 hits a day. 
My current hosting company domain valet gives members free 
accounts and they let you use your own domain name registered 
with internic. How do they do this without giving away free 
IP's i know those websites are on the same machine but how do 
they route them with just the domain name? is it at the 
webserver level? are there indentifiers in a tcp/ip packet that 
tells a node the domain name.  Any help would be greatly 
apreciated as you can see i am frustrated to the point of 
insanity.

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