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Inspect IPv4 and IPv6 networks, masks, ranges and address counts, or test whether an IP belongs to a CIDR block.
AND the address with a prefix mask to find the first address. The host part has 2^(address bits − prefix) possibilities. IPv4 /31 uses legacy host counting by default, with an RFC 3021 point-to-point option. An inline CIDR prefix takes precedence.
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