Get a list of delegated domains from a zone

clean-zone.sh

#!/bin/sh

awk '{
  if (match($0,"^$"))     # remove empty lines
    skip = $1
  else if (match($0,"^;"))     # remove comment lines
    skip = $1
  else if ($1 == "se.")        # remove our own zone
    skip = $1
  else if ($1 == "nu.")        # remove our own zone
    skip = $1
  else if ($4 == "NS")         # match on NS
    print $1
}'|sort -u|sed 's/.$//'