IPv6 (global unicast address)
IPv6 (global unicast address)
The effective range (scope) of IPv6 address unicast is classified as follows.
- global unicast address
- Site-local unicast address (deprecated)
- link-local unicast address
Global unicast addresses are described here.
A global unicast address is defined as a globally unique unicast address, equivalent to the IPv4 global address. The first 3 bits start with '001' and the valid range can also be written as '2000::/3'.
The structure of a global unicast address is as follows.
Within the address range, further usage is determined as follows:
range | Usage | explanation |
2001::/16 | IPv6 Internet | Currently, IANA has assigned 2001::/16 as a global unicast address. When building a network with IPv6, addressing will be performed from the address range of 2001::/16. |
2002::/16 | 6to4 transition mechanism | A special address used in a 6to4 tunnel when transitioning from IPv4 to IPv6. |
2003::/16~3ffd::/16 | unassigned | It is currently unassigned, but can be assigned to a router interface. |
3ffe::/16 | 6bone | For research and development of IPv6 |