IP Tables

-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).