C:\WINNT\system32\drivers\etc\lmhosts.sam
with this file, you can use a 'hostname' to resolve a name to an IP.
However!
This is worthless for a pc on the internet unless its put into that boxes hosts file.
Basically this file just says 'ok you're looking for this host, look here' much like DNS except the hosts file is only useful on the machine its currently on.
If you want a URL so it will work on the internet, then you'll have to get a DNS name. I think as krohn mentioned you can try DNS2Go.com and poke around there.. I myself dont know much about dns providers so I'll leave that to others, but I know they work (you'll prolly get a name like "judolizard.dns2go.com"
So if thats adequate for your needs than feel free

not sure if they charge anything..
--edit--
OOPS
Just re-read that you're on mandrake

Then you can look in /etc/hosts I do believe!

If you're not sure of the syntax type 'man hosts' and see if that pulls up anything