Common IPv6 Address Prefixes

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Type	Prefix	Leading Hex Characters
Global unicast	2000::/3	2 3
Link local unicast	fe80::/10	fe80
Multicast	ff00::/8	ff
Multicast (link local)	ff02::/16	ff02::1 (all nodes) ff02::2 (all routers) ff02::1:2 (DHCP)
Solicited-node	ff02::1:ff00:0/104	ff02::1:ff
Unspecified	::/128	0::0
Loopback	::1/128	::1
Documentation/Examples	2001:db8::/32	2001:db8

• globally unique unicast addresses are widely referred to as /48s
• 0000::/8 block is reserved for special functions
  • two special addresses:
    • unspecified address 0:0:0:0:0:0:0:0
      • host that has not obtained a valid address
      • often expressed as ::
    • loopback address 0:0:0:0:0:0:0:1
      • used for testing
      • sends packet to itself
      • often expressed as ::1