here you can download/see the manpage of iptables: iptables.man.txt

iptables -L;

# -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

-S, --list-rules [chain]
# Print all rules in the selected chain.  If no chain is selected, all chains are printed like iptables-save.
# Like every other iptables command, it applies to the specified table (filter is the default).
admin