Use configured nameserver if available, google's as fallback
Use configured nameserver if available, google's as fallback

mozilla/TLS-Observer,jasonthomas/tls-observatory,jasonthomas/tls-observatory,mozilla/tls-observatory,mozilla/tls-observatory,mozilla/tls-observatory,jasonthomas/tls-observatory,jasonthomas/tls-observatory,jasonthomas/tls-observatory,mozilla/tls-observatory,mozilla/tls-observatory