Hello,
If you do not have a DNS, you could use /etc/hosts like this:
192.168.0.1 hostname1 hostname2 hostname3 ....
hostname2 hostname3 ... are called "aliases"
hostname1 it is called "official host name"
man hosts would help.
If you do have a DNS, you should change your zone to achieve the same thing.
Horia.
Best regards from Romania,
Horia.