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IP subnet calculator
192.157.56.48-192.157.56.255

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192.157.56.48-192.157.56.63
192.157.56.48/28

192.157.56.64-192.157.56.127
192.157.56.64/26

192.157.56.128-192.157.56.255
192.157.56.128/25