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IP subnet calculator
81.0.28.48-81.0.28.167

81.0.28.48-81.0.28.63
81.0.28.48/28

81.0.28.64-81.0.28.127
81.0.28.64/26

81.0.28.128-81.0.28.159
81.0.28.128/27

81.0.28.160-81.0.28.167
81.0.28.160/29