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For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.

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Do any subnets "Network ID" AKA "Network Address" always have an even number as the last octet? [duplicate]

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