These aren’t being announced at the edge. They’re appearing in traceroute responses, and some are directly reachable from inside the AS, which means they’re app

These aren’t being announced at the edge. They’re appearing in traceroute responses, and some are directly reachable from inside the AS, which means they’re appearing in the IGP. Announcing networks in this range to peers would be an huge no-no. You can’t just use any IP: some are truly special (e.g. the multicast range) and 240/4 is still treated as invalid by many currently deployed IP stacks in their off-the-shelf configuration. Getting away with this only works at the kind of integration scale where you’re smelting your own copper, so to speak.