IPv6 addresses in CIDR (Classless Inter Domain Routing) notation

class network_v6 abstracts IPv6 address in CIDR notation providing infos like:
cidr : 2001:0db8::/119
network : 2001:0db8::/119
netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:fe00
address range: 2001:0db8:: - 2001:0db8::01ff