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Possible Duplicates:
How does Subnetting Work?
Is X.Y.Z.0 a valid IP address?

I am a beginner in the field of Networking.

Can 172.30.1.0 be used as hostID?

If not, why?

Please give me a reference regarding you answer.

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closed as exact duplicate by womble, Ward, Iain♦, splattne♦ Jul 31 '11 at 8:32

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

1 Answer

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  • Yes, that IP address can be used as a "host ID".
  • There is unlikely to be an authoritative reference stating that particular IP address is "valid", but this question will be a good resource to understand subnetting in general.
  • Never, ever use the terms "Class A", "Class B", or "Class C" -- they're terms that are 20 years out of date, and you look incompetent when you use them.
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