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IP subnet calculator
104.21.58.0-104.21.72.255

104.21.58.0-104.21.59.255
104.21.58.0/23

104.21.60.0-104.21.63.255
104.21.60.0/22

104.21.64.0-104.21.71.255
104.21.64.0/21

104.21.72.0-104.21.72.255
104.21.72.0/24