Hence the full address format for addresses on the research and development network is:

<48 UNI> <1 Res> <3 Site> <2 Reserved> <6 Networks> <4 Sub-Networks> <64 Host>

There are 6 bits to allocate research and development networks (26 = 64 networks) and they are
allocated in a flat manner.

For example:

2001:630:80:700::/60 - Network 0
2001:630:80:701::/60 - Network 1
2001:630:80:702::/60 - Network 2
2001:630:80:703::/60 - Network 3
…
2001:630:80:73F::/60 - Network 63

Further subnets can be defined arbitrarily based on the 4 bits to allocate for subnets.

So each Mobile IPv6 network is assigned a ::/60 prefix as illustrated in Figure 14-2. Currently each Mobile IPv6 network comprises one Home Agent. Each HA will advertise a ::/64 prefix via Router Advertisements to hosts on its link. Currently there is no stateful address configuration (e.g. using DHCPv6) on our MIPv6 networks and all hosts use stateless address autoconfiguration (remember that not every host on the HA’s link needs to be a MN). A MN will know that it is on its home network when it sees the RA from its HA. It is possible to have multiple HAs per network but we chose this topology as it facilitates easier debugging during testing.