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PING6 IPv6 in South Africa

2Jul/100

Where does that IP come from?

Due to the size of the IPv6 address space it has been possible to reserve large blocks of addresses for specific purposes and reduce the fragmentation of IP blocks considerably. This leads us to be able to quite easily identify the IPv6 addresses which appear in log files and connection lists:

  • 2001:0:* - This block of addresses is assigned to the Teredo protocol. This tunneling protocol is installed by default on Windows Vista and Windows7 operating systems. It is used by hosts behind NAT gateways to reach IPv6 hosts. Teredo is NOT preferred over IPv4 and will only generally be used when a suitable IPv4 connection can't be made. Teredo is quite popular with torrent clients to reach hosts behind a NAT.
  • 2001:200-A000:* - The first global address allocations were made out of this range of prefixes. Typically these are early adopter networks and many of the major tunnel brokers have prefixes in this range.
  • 2002:* - The 6to4 protocol was assigned this prefix. The 8 digits following the initial sequence are a hexadecimal representation of the public IPv4 address that defines the end of the tunnel. 6to4 thus only functions if the tunnel endpoint is a public IP. In the past 6to4 has been popular for providing IPv6 along side IPv4 on residential gateway/router devices.
  • 240*: - Range that was issued to APNIC for users in the Asia and Pacific regions.
  • 260*: - Range that was issued to ARIN for users in the North American region.
  • 280*: - Range that was issued to LACNIC for user in the Latin American region.
  • 2A0*: - Range that was issued to RIPE NCC for user in the European region.
  • 2C0*: - Range that was issued to AfriNIC for user in the African region.
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