lookup a list of domains, return IP's (follow CNAME's to the last A) or NONE

gistfile1.txt

for d in google.com www.google.com rackspace.com www.rackspace.com ; do
  echo -n "$d : "
  result=$(dig +short "$d" | tail -n1)
  if [ -z "$result" ]; then
    echo NONE
  else
    echo "$result"
  fi
done | column  -t