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I've followed this tutorial in setting up Bind on my VPS. I created a dummy domain (test.com) and pointed it to 192.168.0.3 - Same IP as used in the tutorial.

It's all working nicely.

What I'm curious about is: Lets say I have 10 domains on the one IP. Obviously, I would need to create a new zone for each of these domains... But, do I need to create multiple reverse zones? Given that each domain will point to the same IP, can I just use the one reverse zone?

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As reverse zones are matched against ip ranges, an ip address can only exist in one reverse zone. Hence a ip address can only have one PTR record. Just because multiple domain names can point to the same ip address doesn't mean that that ip address can/must reverse to all of them.

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