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IP subnet calculator
81.0.110.0-81.0.121.255

uk ru

81.0.110.0-81.0.111.255
81.0.110.0/23

81.0.112.0-81.0.119.255
81.0.112.0/21

81.0.120.0-81.0.121.255
81.0.120.0/23