Sniffing for multicast traffic

[Ronald Nutter <rnutter () HNTB com>]

I am getting ready to make a change to the network at my company and need to verify what traffic is going over 
multicast.
I have been able to see existing multicast traffic by using a capture filter net 224.0.0.0/4.  How can I see any 
multicast traffic that
Is on the network and isn't using the normal multicast range ?  Havent worked with multicast much, so just trying to be 
on the careful side.

Ron
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