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IP subnet calculator
81.6.13.0-81.6.31.255

uk ru

81.6.13.0-81.6.13.255
81.6.13.0/24

81.6.14.0-81.6.15.255
81.6.14.0/23

81.6.16.0-81.6.31.255
81.6.16.0/20