Reverse DNS Question

[jamesmartin at ieee.org (James Martin)]

All:

In the process of requesting a block of IP's for a client, ARIN requested
that we list Reverse DNS Servers for the block.  I've never done this
before, nor have I ever thought it through.

What is the purpose for this besides resolving name-based reverse lookups?
Are there any definitive guides out there on how this works (besides the
ARIN site)?

I know this is really basic stuff but I don't know it and have never needed
to know it until now.

Thanks

-- 
__________________________________
James Martin
jamesmartin at ieee.org