IPv6 Part2 Addr Types 2
IPv6 subnetting is based on the network address assigned by the ISP and the needs of the organization to subdivide that space. In this example, The network address assigned to the organization is 2001:25:12 (the first 48 bits). The site prefix is /48 decimal and the site prefix plus subnets (ab12) is /64. IPv6 uses the same notation as CIDR in IPv4, there are no subnet masks, only a slash and a decimal number representing the number of bits in the network/subnet. In addition, there are no reserved subnet addresses (network or broadcast) with IPv6 so it is not necessary to account for the first and last address on a subnet when determining the number of valid host addresses (no more n^2 -- 2).
IPv6 subnetting is based on the network address assigned by the ISP and the needs of the organization to subdivide that space. In this example, The network address assigned to the organization is 2001:25:12 (the first 48 bits). The site prefix is /48 decimal and the site prefix plus subnets (ab12) is /64. IPv6 uses the same notation as CIDR in IPv4, there are no subnet masks, only a slash and a decimal number representing the number of bits in the network/subnet. In addition, there are no reserved subnet addresses (network or broadcast) with IPv6 so it is not necessary to account for the first and last address on a subnet when determining the number of valid host addresses (no more n^2 -- 2).