Truth is, when configuring airvpn manually, you need DNS to resolve the IP of a server behind one of the Airvpn clusters (europe.vpn.airvn.org for example). Airdns does not have a DNS server accessible outside the tunnel as it strongly suggests/supports OpenNIC.
OpenNIC is the go-to for AirVPN. But, I have a grudge against OpenNIC. You select any OpenNIC DNS server in Europe for example, and the DNS ends up someplace else, the USA for example. Granted, DNS allegedly only sees the AirVPN IP as soon as the connection is up. But still ... Blinds me why sometimes an OpenNIC from a nice internet country ends up in an ugly internet country. It yanks me every time, and I did try a lot of OpenNIC servers, sooner or later they end up in land I don't want them to end up in.
Then there is OpenDNS, but I'm not too keen on a few aspects, call them personal preferences.
Then there is Google DNS, and the newly raved about cloudflare DNS. Yuk! Yes I know, they only "see" AirVPN IP's as long as the tunnel etc. are running. But since it is used to establish the tunnel, Google knows my IP searched for an AirVPN server and then nothing after that ... So Google knows I use AirVPN, and I hate that. Same with Cloudflare, or other internet evils offering reliable DNS as a source of business intel gathering.
Then there are a few of the other good VPN providers who have publicly accessible DNS servers. Kind of defeats using one VPN to use the DNS of another VPN. It somehow doesn't feel right to do that.
Which DNS service is of OpenNIC philosophy, is reliable to resolve AirVPN, and never ends up in an ugly internet country telling that ugly country I use AirVPN?