Here is a list of all the official recursive domain name servers that virtual and dedicated servers in the Hetzner data centers can use:
The IPv4 adresses of our recursive DNS servers are:
22.214.171.124 126.96.36.199 188.8.131.52
The IPv6 adresses of our recursive DNS servers are:
2a01:4f8:0:1::add:1010 2a01:4f8:0:1::add:9999 2a01:4f8:0:1::add:9898
These DNS servers are DNS load balancer systems.
Due to the load balancer setup, the IP addresses that we use to perform DNS queries from our recursive DNS servers to other authoritative DNS servers are not identical with those IPs mentioned above.
We publish a list of the network ranges from which we perform queries with the TXT record