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IP subnet calculator
81.140.160.0-81.159.255.255

81.140.160.0-81.140.191.255
81.140.160.0/19

81.140.192.0-81.140.255.255
81.140.192.0/18

81.141.0.0-81.141.255.255
81.141.0.0/16

81.142.0.0-81.143.255.255
81.142.0.0/15

81.144.0.0-81.159.255.255
81.144.0.0/12