YARN - container networking and ports

[Brian C. Huffman]

All,

I'm working on writing code for my application to be able to communicate 
between containers.  I want to be sure that I don't trample on the ports 
that YARN is using (for either the nodemanager or the 
containtermanager).  I've looked but can't seem to find what range is 
being used.  Can someone point me in the right direction?

Thanks,
Brian