# comment line (a '#' as very first character)
# a single IPv4 and IPv6 address
#1.2.3.4
#2001:0db8:85a3:08d3:1319:8a2e:0370:7344
# address blocks in CIDR notation
#127.0.0.0/8
#10.11.128.0/17
#192.168.0.0/24
# hostnames
#rome-fw.enterprise.com
#hosts.friends.com