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DNS on Windows Server 2003, 3rd Edition by Robbie Allen, Matt Larson, Cricket Liu

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Checking That Your Network Is Registered

Before proceeding, you should check whether or not your IP network or networks are registered. Some registrars won't delegate a subdomain to name servers on unregistered networks, and network registries (we'll talk about them shortly) won't delegate an in-addr.arpa zone that corresponds to an unregistered network.

An IP network defines a range of IP addresses. For example, the network 15/8 is made up of all IP addresses in the range 15.0.0.0 to 15.255.255.255. The network 199.10.25/24 starts at 199.10.25.0 and ends at 199.10.25.255.

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