Fierce Domain Scan

wget http://ha.ckers.org/fierce/fierce.pl
wget http://ha.ckers.org/fierce/hosts.txt
perl -MCPAN -e 'install Net::DNS'
perl -MCPAN -e 'install Net::hostent'
perl fierce.pl -dns exemplo.com hosts.txt

Fonte:
http://ha.ckers.org/fierce/