CIDR block::/128
:: is contained in the ::/128 Special Purpose Address Block.

::/128 - Unspecified Address
::/128 was allocated on February of 2006

::/128 may be used as the source address of an IP datagram that transits two devices.

::/128 may NOT be used as the destination address of an IP datagram that transits two devices.

::/128 is NOT forwardable.
A router may NOT forward an IP datagram to ::/128 between external interfaces.

::/128 is NOT globally reachable
An IP datagram may NOT be forwarded to ::/128 beyond a specified administrative domain.

The RFC that created ::/128 requires all compliant IP implementations to behave in a special way when processing packets either to or from addresses contained by ::/128

[ RFC4291, ^ ]

Number of IP addresses in the block 1
Netmaskffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Range [First - Last]:: - 0000:0000:0000:0000:0000:0000:0000:0000
Last Address long form 0000:0000:0000:0000:0000:0000:0000:0000
Last Address short form ::   !ip6 !rdap !whois !ptr !dnstr !tr !scan !g
Network/First Address long form 0000:0000:0000:0000:0000:0000:0000:0000
Network/First Address short form ::   !ip6 !rdap !whois !ptr !dnstr !tr !scan !g

!g ::/128
  
  ___________   ______________
             | /
             |/
                        
        |\       /|
       /  \^____/  \
     ||  ___   ___  ||
    |||  \__| |__/  |||
     ||             ||
       \/         \/
        \|       |/
         \ _____ /
         | \___/ |
      _  /\_____/\  _
      \\/IPDUHUDPI\//