Enter two space-separated values: the DNS query name followed by the nameserver. For example: `myip.opendns.com resolver1.opendns.com`.

Virtualmin uses `dig` to request an A record for IPv4 or an AAAA record for IPv6 from the specified nameserver. If this field is set to No, `dig` is unavailable, or the query fails, Virtualmin uses the configured HTTP detection service instead.

When the system is behind NAT, a proxy, or a VPN, the result is the public address of that gateway or endpoint rather than an address assigned directly to the system.