gets the actual TTL rather than the TTL a user's machine has.

ttl.sh

#!/bin/bash

if [ -z "${1}" ] ;
  then
  echo 'Please enter the address the TTL should be found for'
  exit 1
fi
NS=`host -t NS $1 | awk {'print $4'}`
arr=$(echo $NS | tr " " "\n")
for x in $arr
do
        dig @$x $1 +noall +answer
done