Problem solved.
What do you mean by zone IDs?
Elaborate on your problem a bit more in-depth please.
Me Amigos.
Well, I’ll be honest here that this sounds like a programming related question, more than a panda3d one.
You will need to store your ‘zone id’s’ inside of an array and deal with them that way. (google for “python arrays”)
That is one of the many ways you get store data in python, however unless I actually see some real code, or get a better understanding of your code, there is no way I can help. 
For those who don’t know the zone id is part of the distributed network system.
You will probably want ClientRepository.interestZones