If your DNS is hosted by TornevallNET and need to point out a specific amount of nameservers, this is the page you should look at.
Recursive DNS servers (Use for anyone)
DNS-Servers marked with PARTIALLY RECURSIVE is, as said, "partially" recursive (allows requests from "anyone"). By means, chosen networks - mostly located in Sweden - are allowed to use them as they normally use servers like 126.96.36.199, 188.8.131.52, 184.108.40.206, etc. By chosen networks Telia, Tele2, Bredbandbolaget, parts of OVPN.COM, etc etc, are allowed.
If you feel the resolvers is failing in such cases for you, take a look at the permission list at https://auth.tornevall.net/dns-recursion.txt and/or contact firstname.lastname@example.org if you wish to update something. This permission list shows you which networks that is normally allowed to do recursive requests.
There are more servers like below, that allows recursion but those are the publicly maintained list.
220.127.116.11, or the IPv6-filtered all-recursion DNS has been removed since Netflix "works" again.