Iptables list

Hello,
configuring iptables rules,
how I can find out if one port number I want to use is already in use?
example:

$IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol udp --dport
${UDP_PORT} --destination localhost
$IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp --dport
${TCP_PORT} --destination localhost
$IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp --dport
${TCP_HOST_PORT} --destination localhost

How I can check if these ports (UDP_PORT TCP_PORT TCP_HOST_PORT) are in use
from another application?


--
'The Magic Is In the Movement'

Marco Savo
SW Engineer

882 East Glenn St.
Tucson, AZ 85719
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