Trying to figure out a specific address from log

The IP is

Using ARIN, I see that it’s a IANA, but other than that I haven’t figured out why I’m getting these hits to my broadcast address in my logs (I’m using a Block IP In from any to any global rule).

I’m pretty certain this isn’t anything harmful, but I’d be grateful if anyone can provide any insight into these hits.

edit: I forgot to mention, I’m using ver. 3.0.15