IPv6 defines at least three reachability scopes for addresses:
- Globally addressable. This is an IPv6 address given to you by your ISP. It is available to use on the public Internet.
- Link-local. This is similar to the 169.254.x.x range. It is an address that a computer assigns itself in order to facilitate local communications. These addresses don’t get routed around on the public Internet because they’re not globally unique. such as fe80::/64
- Node-local. This is an address that identifies the local interface, similar to 127.0.0.1. Such as, this is the address ::1.
