Content #
IP addresses in the Class E range were set aside for future and experimental use and are not assigned publicly.
They range from 240.0.0.0 to 247.255.255.255.
Your machine should never see packets from these source addresses—and mostly likely won’t. (Because the entire address range is permanently reserved up through 255.255.255.255, the Class E range can realistically be defined as 240.0.0.0 to 255.255.255.255. In fact, some sources define the Class E address range to be exactly that.)
From #
Linux Security: Enhancing Security with nftables and Beyond