Syntax : csf -g ipaddress
EX :
[root@server ~]# csf -g 190.161.18.37
Chain num pkts bytes target prot opt in out source destination
LOCALINPUT 109 881 46544 DROP all -- !lo * 190.161.18.37 0.0.0.0/0
LOCALOUTPUT 104 0 0 DROP all -- * !lo 0.0.0.0/0 190.161.18.37
csf.deny: 190.161.18.37 # lfd: (PERMBLOCK) 190.161.18.37 has had more than 4 temp blocks in the last 86400 secs - Wed Apr 28 14:58:04 2010
[root@server ~]#
OR
cat /etc/csf/csf.deny | grep ipaddress