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IP subnet calculator
173.239.0.0-173.239.18.255

uk ru

173.239.0.0-173.239.15.255
173.239.0.0/20

173.239.16.0-173.239.17.255
173.239.16.0/23

173.239.18.0-173.239.18.255
173.239.18.0/24