getting dns aliases for a computer

If I have a computer in a domain called mycomputer, it will have a host name
of mycomputer.mydomain.com. I've also created dns aliases for this such as
myalias1.mydomain.com and anotheralias.mydomain.com.

I would like to write or find a function that based on an ip or host name
will return me all the dns aliases, so if I supply 'mycomputer' I'd get
myalias1 and anotheralias back. Is there any code or links that would help
me do this?