IPv6 (site-local unicast address)
IPv6 (site-local 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
Site-local unicast addresses are described here.
A site-local unicast address is a unicast address that is valid only within the same site.
The bit pattern "1111 11110 11", which in hexadecimal notation starts with "fec0::/10". For the same purpose as IPv4 private addresses, use IPv6 addresses freely on networks that are not connected to the Internet. Use is limited to use within a specific site.
Since the address structure does not have information that identifies the site itself, multiple sites may end up with duplicate addresses.
Site-local unicast addresses were abolished by RFC3879, which came into force in September 2004, and unique local unicast addresses were defined as new local addresses in RFC4193.