Hi,
In most cases "multicast" is on in devices. For example, that's how your Windows computer finds "other devices" on the network (through UPnP). However if your task requires more like "global presence", it depends on devices that build your network - switches, routers, firewalls, WiFi, etc. Some of them may support natively, some may require special configuration, and some may not support multicast at all. Then, when it gets bigger, it comes to the "multicast protocols" (for example, IGMP, PIM, etc.).
What is your goal? Depending on that you may need to discover your options.
Good luck,
Michael Shavrov / Cisco CCNP, CCDP, CCSP, CCSP
www.headsetadapter.com
https://en.wikipedia.org/wiki/IP_multicast
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