Windows

DNS and subnet masking are really separate issues. A DNS record only associates a hostname with a particular IP address (or addresses) and does not involve a subnet mask.

Subnet masking is for dividing the IP address space into manageable chunksand keeping the routing in order to get to that address.

So to answer your question, no, it is not mandatory that different domains have a different and unique subnet mask.

Nor is it even necessary that their IP addresses be unique. For example, you could have an Exchange server sitting at a particular IP address receiving mail for many different domains. For all of those domains, the MX record would point to the same IP address.

I hope this helps answer your question.

paul

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