Properly calculate and show the cidr mask for ipv4
Properly calculate and show the cidr mask for ipv4

This updates blockfinder to actually be useful for fetching a list of ipv4
hosts. It is now possible to request a country and it will return a full list
of ipv4 cidr masked blocks.

Starefossen/docker-blockfinder,ioerror/blockfinder,d1b/blockfinder,ioerror/blockfinder,Starefossen/docker-blockfinder,d1b/blockfinder