dnsprop

#!/bin/bash
# simple nameserv propogation check util

if [ $# -ne 2 ]; then
    echo "usage: dnsprop <record type> <domain>"
    exit 1
fi

record_type=$1
dns_name=$2

declare -a resolver_ips=(
    "1.1.1.1"
    "8.8.8.8"
    "8.8.4.4"
    "9.9.9.9"
    "208.67.222.222"
    "208.67.220.220"
    "77.88.8.8"
    "64.6.64.6"
    "64.6.65.6"
    "74.82.42.42"
)

declare -a resolver_names=(
    "Cloudflare"
    "Google"
    "Google Secondary"
    "Quad9"
    "OpenDNS"
    "OpenDNS Secondary"
    "Yandex.DNS"
    "Verisign"
    "Verisign Secondary"
    "Hurricane Electric"
)

echo "checking DNS propagation for '$record_type' record of '$dns_name' against top 10 resolvers:"

for i in "${!resolver_ips[@]}"; do
    resolver="${resolver_ips[$i]}"
    resolver_name="${resolver_names[$i]}"
    echo -n "checking resolver $resolver ($resolver_name): "
    results=$(timeout 1 dig +short @$resolver $dns_name $record_type | tr '\n' ', ' | sed 's/, $//')
    if [ -z "$results" ]; then
        echo "no reply"
    else
        echo "reply received ($results)"
    fi
done