Not sure if this is a new occurrence or has always happened and we just noticed. We are trying to use OVRC which is a simple network scanning device that scans the network and lets us know of offline devices. It is skipping multiple items due to duplicate MAC's.
Anything over .100 is a Dahua, or possibly a Uniview camera, but not Ubiquiti. Radios start at .51.
101 - 105 or 106, are probably hardwired to the headend, the rest of the cameras are on a wireless link.