isRand marked every locally administered unicast address, CID ranges
included. A CID is assigned local space (IEEE 802c ELI), so an address a
registered CID covers is no longer reported as random. For the rest the
U/L bit stays the signal: it is the only mark randomization leaves on an
address, and what the previous provider reported.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>