Fix CIDR prefix calculation
Fix CIDR prefix calculation

lispnik/iolib,attila-lendvai/iolib,attila-lendvai/iolib,shamazmazum/iolib,attila-lendvai/iolib,shamazmazum/iolib,deadtrickster/iolib,dkochmanski/iolib,deadtrickster/iolib,sionescu/iolib,sionescu/iolib,dkochmanski/iolib,deadtrickster/iolib,shamazmazum/iolib,lispnik/iolib,dkochmanski/iolib,tiago4orion/iolib,tiago4orion/iolib,tiago4orion/iolib,lispnik/iolib,sionescu/iolib