2001:00::21   !ip6 !rdap !whois !ptr !dnstr !tr !scan !g
CIDR block	2001::/64
2001:00::21 is contained in the 2001::/32 Special Purpose Address Block. 2001::/32 - TEREDO 2001::/32 was allocated on January of 2006 Addresses in 2001::/32 may be used as the source address of an IP datagram that transits two devices. Addresses in 2001::/32 may be used as the destination address of an IP datagram that transits two devices. Addresses in 2001::/32 are forwardable. A router may forward an IP datagram to Addresses in 2001::/32 between external interfaces. [ RFC4380, ^ ] [ RFC8190, ^ ]
Number of IP addresses in the block	18446744073709551616 (1.844674e+19)
Netmask	ffff:ffff:ffff:ffff:0000:0000:0000:0000
Range [First - Last]	2001:: - 2001:0000:0000:0000:ffff:ffff:ffff:ffff
Last Address long form	2001:0000:0000:0000:ffff:ffff:ffff:ffff
Last Address short form	2001::ffff:ffff:ffff:ffff   !ip6 !rdap !whois !ptr !dnstr !tr !scan !g
Network/First Address long form	2001:0000:0000:0000:0000:0000:0000:0000
Network/First Address short form	2001::   !ip6 !rdap !whois !ptr !dnstr !tr !scan !g
!g 2001:00::21/64

  
  ___________   ______________
             | /
             |/
                        
        |\       /|
       /  \^____/  \
     ||  ___   ___  ||
    |||  \__| |__/  |||
     ||             ||
       \/         \/
        \|       |/
         \ _____ /
         | \___/ |
      _  /\_____/\  _
      \\/IPDUHUDPI\//