Script to check a domain name against several public DNS servers.

digger.sh

#!/bin/bash


DOMAIN=$1;

if [ -z "$DOMAIN" ]; then

    echo "USAGE: ./digger <your-domain>"

else
    echo "Testing $DOMAIN"

    # Here's a list of public name servers.
    # See: https://www.lifewire.com/free-and-public-dns-servers-2626062
    declare -a nameservers=("209.244.0.3" "64.6.64.6" "8.8.8.8" "84.200.69.80" "8.26.56.26" "208.67.222.222" "199.85.126.10" "81.218.119.11" "195.46.39.39" "96.90.175.167" "208.76.50.50" "216.146.35.35" "37.235.1.174" "77.88.8.8" "91.239.100.100" "74.82.42.42" "109.69.8.51")

    for ns in "${nameservers[@]}"
    do
        RESULT=$(dig @$ns +short $DOMAIN)
        echo "GOT: $RESULT <--- from: ${ns}"
    done
fi