224.0.0.1 in ufw logs ??

I am getting a fair number of syslog entries showing blocked input by 224.0.0.1.

I have read that 224.0.0.1 is, "The All Hosts multicast group addresses all hosts on the same network segment."

There is no port info, just the usual such as "SRC=0.0.0.0 DST=224.0.0.1" and a puzzling PROTO=2

Probably nothing, just very curious.