Let's say we have an IP that is dropped by iptables 192.168.20.2
service iptables status|grep 192.168.20.2
184 DROP all -- 192.168.20.2 0.0.0.0/0
You can use iptables itself like this to list the line numbers:
iptables -L --line-numbers
Two Ways To Delete The iptables Rule........