Below is a sample copy of a csf.deny file.
###############################################################################
# Copyright 2006-2010, Way to the Web Limited
# URL: http://www.configserver.com
# Email: sales@waytotheweb.com
###############################################################################
# The following IP addresses will be blocked in iptables
# One IP address per line
# CIDR addressing allowed with a quaded IP (e.g. 192.168.254.0/24)
# Only list IP addresses, not domain names (they will be ignored)
#
# Note: If you add the text “do not delete” to the comments of an entry then
# DENY_IP_LIMIT will ignore those entries and not remove them
#
# Advanced port+ip filtering allowed with the following format
# tcp/udp|in/out|s/d=port|s/d=ip
#
# See readme.txt for more information regarding advanced port filtering
#
217.219.244.41 #
67.117.201.128 #
117.0.0.0/8 # (117.0.0.0 – 117.255.255.255)
23.20.0.0/14 # (23.20.0.0 – 23.23.255.255)
50.16.0.0/15 # (50.16.0.0 – 50.17.255.255)
50.19.0.0/16 # (50.19.0.0 – 50.19.255.255)
67.202.0.0/18 # (67.202.0.0 – 67.202.63.255)
72.44.32.0/19 # (72.44.32.0 – 72.44.63.255)
75.101.128.0/17 # (75.101.128.0 – 75.101.255.255)
107.20.0.0/14 # (107.20.0.0 – 107.23.255.255)
174.129.0.0/16 # (174.129.0.0 – 174.129.255.255)
184.73.0.0/16 # (184.73.0.0 – 184.73.255.255)
184.72.128.0/17 # (184.72.128.0 – 184.72.255.255)
184.72.64.0/18 # (184.72.64.0 – 184.72.127.255)
204.236.192.0/18 # (204.236.192.0 – 204.236.255.255)
23.20.0.0/14 # (23.20.0.0 – 23.23.255.255)
207.148.192.0/19 # (207.148.192.0 – 207.148.223.255)
93.0.0.0/8 # (93.0.0.0 – 93.255.255.255)
211.167.96.0/19 # (211.167.102.1 – 211.167.102.255)
66.194.6.0/24 # (66.194.6.0 -66.194.6.255)
91.194.158.0/23 # (91.194.158.0 – 91.194.158.255)
192.132.210.0/24 # (192.132.210.0 – 192.132.210.255)
204.15.64.0/21 # (204.15.64.0 – 204.15.64.255)
208.80.192.0/21 # (208.80.194.0 – 208.80.194.255)
38.0.0.0/8 # (38.0.0.0 – 38.255.255.255)
80.79.112.0/20 # (80.79.120.128 – 80.79.120.255)
109.0.0.0/8 # (109.0.0.0 – 109.255.255.255)
92.0.0.0/8 # (92.0.0.0 – 92.255.255.255)
67.112.0.0/12 # (67.112.0.0 – 67.127.255.255)
50.16.0.0/14 # (50.16.0.0 – 50.19.255.255)
