foo.domain.tld => ip:port

Ok....

So, I would like to point a sub domain at an ip address:port ie: 12.34.56.78:84

Anyone got any idea how?

I am assuming that i could ues some kind of script. Maybe something in php, that gets the referrer and then runs a series of if else statements and depending on which one is triggered it would forward it to the particular ip:port combination.

Is this possible?
If so, how do I get the information (referring page)

Thanks...