koreanDnsLookup

#!/bin/bash

declare -A DNS

DNS["KTDNS"]="168.126.63.1 168.126.63.2"
DNS["SKBroadBand"]="210.220.163.82 219.250.36.130"
DNS["LGUPlus"]="164.124.101.2 203.248.252.2"
DNS["LGHelloVision"]="180.182.54.1 180.182.54.2"
DNS["Dacom"]="164.124.101.2 203.248.252.2"
DNS["PowerCom"]="164.124.107.9"
DNS["DreamLine"]="210.181.1.24 210.181.4.25"
DNS["Google"]="8.8.8.8 8.8.4.4"
DNS["CloudFlare"]="1.1.1.1 1.0.0.1"

for SERVICE in "${!DNS[@]}"; do
    echo ===================================
    echo =======      $SERVICE
    echo ===================================
    for NS in ${DNS[$SERVICE]}; do
        if [[ "x$2" == "x" ]]; then
            nslookup $1 $NS
        else
            nslookup $2 $1 $NS
        fi
    done
done