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Ross-CFlag for United Kingdom of Great Britain and Northern Ireland

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Subnetting Help

I am currently reading/learning about subnetting I have mostly got the hang of it now but am struggling with
a couple of questions on the practice exam.

what is the valid ip range for the subnet 144.45.24.0/21?

what is the valid ip range for the subnet 140.10.10.0/23?

the number of valid subnets on the 20.0.0.0  255.254.0.0 is ?

please could someone explain the process to work out the above I'm fine with anything /24 or above but
stuggling with these.

Many Thanks
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archonas
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ASKER

Yes that's right Frabble. I have been studying submitting and understand the binary etc. I am just struggling with the best way to work out questions like the ones in my post.
Thanks for the correction Frabble. That was a typo on my part for the 144.45.24.0/21 address range.
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Many thanks to you both