Reverse Zone, Can It Be One Big Class B?

Reineman, Rick Rick.Reineman at
Thu Nov 30 22:13:55 UTC 2017

The subject is a little off, I have a Class B network masked down to a bunch of Class C networks.

I am replacing an old DNS service where they configured it as one might expect with one reverse mapping file per network.  So we have many of these files.

I don't see any reason why I can't treat my reverse mapping file as if it were all Class B addresses.  So one big reverse mapping  file just like my forward mapping file.  This would make management of the reverse mapping file much easier.

This is a smallish internal network, about 900 hosts or so.  We're doing no delegation.

So my question is, is there a good reason why I should not do this?  It's been awhile since I had a DNS project and have never managed it on a Class B with Class C masked networks before.


Rick Reineman
IDT Engineering, San Jose, Ca.
Senior UNIX Administrator

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