/etc/hosts.deny example
#
# hosts.deny    This file describes the names of the hosts which are
#               *not* allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
# Version:      @(#)/etc/hosts.deny     1.00    05/28/93
#
# Author:       Fred N. van Kempen, waltje@uwalt.nl.mugnet.org
#
#

ALL:.hackerdomain.com

# End of hosts.deny.