UDP Port Utilization

Fellow Tru64 Managers,

We have an application running on a Compaq ES40/ES45 with a Tru64 5.1B
OS that listens on udp port 3000 and have found that there is a range of
udp ports that some application is listening on that sometimes collides
with our desired port.  The range of consecutive ports varies as we go
from one system to another so the collision occurs on only one of our
systems.  The theory is that some application is reserving a range of
ports, but the range is not consistent from one system to another.  

By issuing a netstat -na command, we typically see a range of udp port
numbers consumed along with various individual udp ports.  Unfortunately
for us, the range of ports on one of our systems encompasses our port
3000.  Is there any way we can find out what application(s) is listening
on the range of ports?  Taking 3 systems for example, we see that ports
4851-4864 are taken on one system, 3851-3864 on another 1378-1405 on yet
another.  

All answers much appreciated.

Tom Duffy
Ph: 410-788-0226
[email protected]