Servers are colocated in a datacenter in Turku, Finland.
DNS: 2001:67c:2970::53 / 192.26.105.53
DNS64: 2001:67c:2970::53:64 (using the well-known prefix)
We do not log DNS queries to disk/memory, but we occasionally use tcpdump for debugging. Unbound verbosity is set to 1 (see unbound.conf(5)).