Iptables -L

 iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

See also

• iptables, ufw, firewalld, nftables firewall-cmd, netfilter-persistent, iptables -L, iptables-save, iptables-restore, Netfilter