Prefix Lengths
The last 64 bits of a IPv6 address is always generated by the NIC, the first 64 are given by your Internet Service Provider
- Standard devices get 64bits of prefix
- ISP’s network devices get 48 bits of prefix and 16 subnet bits
The last 64 bits of a IPv6 address is always generated by the NIC, the first 64 are given by your Internet Service Provider