Mark Andrews wrote:
It announces itself to an address which remains under the control of USC/ISI the current and on going root server operator for b.root-servers.net. So apart from leaking that the root hints have not been updated I don’t see a big risk here. The address block, as has been stated, is in a reserved range for critical infrastructure and, I suspect, has special controls placed on it by ARIN regarding its re-use should USC/ISI ever release it / cease to be a root-server operator. I would hope that ARIN and all the RIRs have the list of current and old root-server addresses and that any block that are being transferred that have one of these addresses are flagged for special consideration.
I'm afraid that "old root-server addresses" will not be considered for "critical infrastructure" at least by those people who can't see operational difficulties to change the addresses. Masataka Ohta