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If I set up an AWS VPC with CIDR of 10.0.0.0/20 then the range is 10.0.0.0 to 10.0.15.255
I make a subnet now. Why does 10.0.15.15/28 give an error. Isn't it's range 10.0.15.15 to 10.0.15.30 which is within the VPC?

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  • /28 is 16 addresses. 0-15, 16-31, etc. (0 and 15 -- all-zeros and all-ones addresses -- are reserved for network and broadcast) – Ricky Jan 8 at 2:20
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Isn't it's range 10.0.15.15 to 10.0.15.30 which is within the VPC?

Yes, but it's not a valid /28.

10.0.15.0/28 or 10.0.15.16/28 are valid ranges.

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