Types and Categories of IPv6 Addresses
|Address type||Binary prefix||IPv6 notation|
|Unspecified||00 . . . 0 (128 bits)||::/128|
|Loopback||00 . . . 1 (128 bits)||::1/128|
|Global unicast||(everything else)|
- An identifier for a single interface. A packet sent to a unicast address is delivered to the interface identified by that address. It can be link-local scope, site-local scope, or global scope.
- An identifier for a group of interfaces (typically belonging to different nodes). A packet sent to a multicast address is delivered to all interfaces identified by that address.
- An identifier for a group of interfaces (typically belonging to
different nodes). A packet sent to an anycast address is delivered
to the closest member of a group, according to the routing protocols'
measure of distance.
Anycast addresses are taken from the unicast address spaces (of any scope) and are not syntactically distinguishable from unicast addresses. Anycast is described as a cross between unicast and multicast. Like multicast, multiple nodes may be listening on an anycast address. Like unicast, a packet sent to an anycast address will be delivered to one (and only one) of those nodes. The exact node to which it is delivered is based on the IP routing tables in the network.
There are no broadcast addresses in IPv6. Multicast addresses have superseded this function.