How to pick a Site-Local Scope multi cast address

["Dave Raskin" <dave.raskin () rimage com>]

Hello, I have been directed to this list by IANA when I asked the
following question:



        I am researching ways of device/machine discovery on the
network. This 
 is similar to the Discovery phase of UPnP devices, which uses the SSDP 
 protocol.
  
        I have researched far enough to know that my best bet for UDP 
 multicast address group is the Site-Local Scope address range of
  
      239.255.000.000-239.255.255.255
  
 SSDP and UPnP protocols use the address 239.255.255.250
  
 My question is this:
  
      How do I pick a group address within this range and not have a
chance of colliding with some other application on the network already
using the group  address I just picked?


        Do I just randomly pick an address in that range and hope for
the best? I am running on Windows and cannot assume that there is a
MADCAP server available.



Thanks in advance!

Dave Raskin
Rimage Corporation