PARALLEL_MAX=1024
(
for A in a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9; do
for B in a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9; do
for C in a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9; do
for D in a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9; do
for TLD in com net org; do
	export domain="$A$B$C$D.$TLD"
	. parallel sh -c '
		file=results/$domain
		host -W 20 -t SOA $domain > $file
		host -W 20 -t NS $domain >> $file
		host -W 20 $domain >> $file
	'
done
done
done
done
done
)