wiki/IPv6-Anycast.md

We provide some anycast services over IPv6.

## Anycast address space

**fd42:d42:d42::/48** is reserved for anycast services.

Each anycast service runs on a dedicated /64 in this range.  This way, nobody needs to update filters.

Remember, if you announce an anycast /64, then you need to provide **all** services within this /64. It's probably simpler to only provide one service for each /64.

## Anycast services

| **Name** | **/64 prefix announced** | **Service address** | **Protocol/port** | **Comment** | 
|----------|-------------------------|---------------------|-------------------|---|
| Recursive DNS resolver | `fd42:d42:d42:53::/64` | `fd42:d42:d42:53::1` | UDP/53 | `.` and `dn42.` [Providers](Providing-Anycast-DNS#Persons-providing-anycast-DNS-for-IPv6) |

### Future services

- streaming
- other kind of DNS (authoritative-only, recursive for `dn42` only)