IPv6 was designed to replace IPv4's 32-bit address space with 128-bit addresses, enough that address scarcity and most NAT go away. An IPv6 address is written as eight groups (hextets) of four hexadecimal digits separated by colons, for example 2001:0db8:0000:0000:0a00:0000:0000:0001. Like IPv4, it has a prefix length: most LANs use a /64, where the first 64 bits identify the subnet and the last 64 bits, the interface ID, identify the host.
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