#!/bin/sh
S=${IFS}
IFS=.
for P in $1; do
TLD=${P}
done
IFS=${S}
echo "TLD: ${TLD}"
DNSLIST=$(dig +short ${TLD}. NS)
for DNS in ${DNSLIST}; do
echo "Checking ${DNS}"
dig +norec +nocomments +noquestion +nostats +nocmd @${DNS} $1 NS