token-validator: display user associated domain and delegation

checker/checker.go

@@ -86,8 +86,10 @@ func check_dns(domain, ip string) (aaaa net.IP, err error) {
 		err = errors.New("failed to get a valid answer")
 	}
 
-	if len(r.Answer) > 0 {
-		aaaa = r.Answer[0].(*dns.AAAA).AAAA
+	for _, answer := range r.Answer {
+		if t, ok := answer.(*dns.AAAA); ok {
+			aaaa = t.AAAA
+		}
 	}
 
 	return