1.4.4 Structure of IP Addresses
nIPv4 uses 32
bits for addressing, whereas IPv6 has
assigned 128 bits.
nBoth IPv4 and IPv6 have a particular structure for their address space: it is partially hierarchical, it has an
internet routing part and a local routing part.
nSubnet addressing was introduced to facilitate the routing and administration within organizations. If forms part of the local part and does not affect the internet routing.
nIPv4 has 5 address classes. An organization is assigned an address space in a class based upon its size.