administration tool for IPv4 packet filtering and NAT

-L, --list [chain]
       List  all rules in the selected chain.  If no chain is selected, all chains are listed. Like every
       other iptables command, it applies to the specified table (filter is the default),  so  NAT  rules
       get listed by
        iptables -t nat -n -L
       Please  note that it is often used with the -n option, in order to avoid long reverse DNS lookups.
       It is legal to specify the -Z (zero) option as well, in which case the chain(s) will be atomically
       listed and zeroed.  The exact output is affected by the other arguments given. The exact rules are
       suppressed until you use
        iptables -L -v

-n, --numeric
       Numeric output.  IP addresses and port numbers will be printed in numeric format.  By default, the
       program will try to display them as host names, network names, or services (whenever applicable).