Publisher's description - AirPort Port Inspector 1.0
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AirPort Port Inspector is a free and easy to use program which provides monitoring of the port maps used by hosts associated with an AirPort base station when NAT is used.
AirPort Port Inspector provides both a detailed and simplified view of open ports; the detailed view shows information on the remote hosts being accessed by local hosts, while the simplified view just shows the number of ports used by each local host.
A consequence of this is that the utility can be used to monitor the local hosts which are associated with a base station - however, note that only hosts which have recently made active connections to the "outside world" will show up.