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these numbers mean how many bits of the IP address you want to keep in the IP address range.
example
123.45.0.0/16 means all ip addresses from 123.45.0.0 to 123.45.255.255
123.45.67.0/24 means all ip addresses from 123.45.67.0 to 123.45.67.255
123.45.67.89/32 means just this IP address.
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