PostgreSQL network discovery

Hi,

There is a nice little feature within MSSQL where it is possible to
enumerate all MSSQL servers on the local network. 
I wonder how this can be made possible with PG. Pinging every IP:PGPORT
within the current subnet is one of the options but I guess that would be
just a bad solution.  Any thoughts?

Regards,
Gevik
http://www.truesoftware.net/gevik/