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TOPIC: Can i use this address as class A?

Can i use this address as class A? 10 years 1 month ago #17825

  • Novastorm
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Having an argument with a friend, we got asked a question, i'll trim it down to the bare minimum required.

You are allocated 138.0.0.0
You require 1024 USABLE hosts per subnet.
What subnet mask would you use?

The argument: Can this address be treated as a Class A address in order to gain more than 32 subnets (30 usable)?

Thanks
IPCop 1.4.11 on Intel Celeron 533mhz, 576mb RAM, 40gb HDD, 2 x 3COM 10/100 NICs on 256/64kbps ADSL
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Re: Can i use this address as class A? 10 years 1 month ago #17827

  • FallenZer0
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In Classful, the IP 138.0.0.0 falls under Class-B. N.N.H.H

To have 32 subnets, you would borrow 5 bits from third Octet. This will leave 11 bits for the Host.

N.N.NNNNNHHH.HHHHHHHH

Resultant Subnet Mask = 255.255.248.0
-There Is A Foolish Corner In The Brain Of The Wisest Man- Aristotle
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