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2000::/3 是什么地址?

2000::/3 是什么地址?

作为IPV6缺省路由对应的目的网络,2000::/3比::/0更精确,类似IPV4中0.0.0.0/1,128.0.0.0/1比0.0.0.0/0更精确。

The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of FF00::/8. [RFC4291] IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3.

Only one eighth of the total address space is currently allocated for use on the Internet, 2000::/3, in order to provide efficient route aggregation, thereby reducing the size of the Internet routing tables; the rest of the IPv6 address space is reserved for future use or for special purposes.

参考:
http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.txt
https://forums.he.net/index.php?topic=1896.0
https://en.wikipedia.org/wiki/IPv6_address

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