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IP subnet calculator
100.27.240.0-100.28.205.255

100.27.240.0-100.27.255.255
100.27.240.0/20

100.28.0.0-100.28.127.255
100.28.0.0/17

100.28.128.0-100.28.191.255
100.28.128.0/18

100.28.192.0-100.28.199.255
100.28.192.0/21

100.28.200.0-100.28.203.255
100.28.200.0/22

100.28.204.0-100.28.205.255
100.28.204.0/23