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224.0.0.2 & 224.0.0.252

what is the significance of multicast ip 224.0.0.2 and 224.0.0.252 which ip found in my pc arp resolution ? 

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224.0.0.2: The All Routers

224.0.0.2: The All Routers multicast group addresses all routers on the same network segment.

224.0.0.252: Link-local Multicast Name Resolution (LLMNR) address, used by Microsoft products.

Source: Wikipedia

Empirically normal multicast traffic.

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