ErrAuthoritativeNoResponses is the error returned when an authoritative nameserver indicates that there are no responses to the given query.

ErrMaxDepth is returned when recursive resolving exceeds the maximum depth limit for this package.

ErrNoResponses is returned when our resolution process completes with no valid responses from any nameserver, but no authoritative server explicitly returned NXDOMAIN.

Resolver is a recursive DNS resolver that is designed for looking up A and AAAA records.