In command format with -S:
iptables -S
In table format with -L:
/sbin/iptables -L iptables -L iptables -L INPUT iptables -L OUTPUT
Show rule stats (#packets/#bytes) with -v:
iptables -L -v
To clear stats counters:
sudo iptables -Z sudo iptables -Z INPUT
For given protocol, device and port:
sudo iptables -A INPUT -i eth0 -p tcp --dport 9200 -j DROP
To delete rule:
sudo iptables -D INPUT -i eth0 -p tcp --dport 9200 -j DROP