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IP subnet calculator

uk ru

51.77.128.0-51.77.159.255
51.77.128.0/19

51.77.160.0-51.77.167.255
51.77.160.0/21

51.77.168.0-51.77.171.255
51.77.168.0/22

51.77.172.0-51.77.173.255
51.77.172.0/23