IPv6 network address ranges are written in CIDR notation, which is a condensed pattern of an internet protocol address and its related routing prefix.
An IPv6 network is indicated by the first address in the block, a slash, and a decimal value equal to the size in bits of the prefix.
In an IPv6 network, the routing prefix of an interface address may be automatically specified with the address by CIDR notation. For example, the arrangement of an interface with the address 2001:db8:a::658 connected to subnet 2001:db8:a::/78 is written as 2001:db8:a::658/78.
IPv6 is evolved from IPv4, which is the current standard on which internet traffic is based. An Ipv6 network provides customers with increased flexibility, greater interoperability, more efficient networks, latest technologies, and the ability for networks to exchange traffic within an IPv6 environment.