Hello!
VPN DNS and "Assigned IP address" technical specifications just changed. All the changes have been reported in the https://airvpn.org/specs page.
The changed section is:
Assigned IP
Servers support both IPv4 and IPv6 tunnels and are reachable over IPv4 and IPv6 on entry-IP addresses.
DNS server address is the same as gateway, in both IPv4 and IPv6 layer.
Chosen IPv4 Local Address
OpenVPN: 10.{daemon}.*.*, Subnet-Mask: 255.255.255.0
W