Should a subnet have a "Network ID" AKA "Network Address" (eg: the first address, which is always unusable, and is the boundary between the previous subnet and the current subnet) always have an even number as the 4th IPv4 octet?
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This two-part answer explains about that. – Ron Maupin Jul 27 '21 at 00:51
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1/32 and /31 are real, legal prefixes. – Ricky Jul 27 '21 at 01:49