Notation (Cont.)

• IPv4 addresses can be expressed as IPv6 addresses by pre-pending 96 zeros

• • I.e., ::149.112.240.156
  • Mostly depreciated

• Rather than a netmask, IPv6 uses a prefix

• • Takes on values between 0 and 128
  • • Typical values: 32, 40, 48, 64
  • But like a v4 netmask, it indicates the boundary between the network and host parts of an address
  • Similar notation
  • I.e., FE80::/48
  • • 48 high order bits used for routing
    • 80 low order bits used for subnet + host addresses