A policy decision by whom? Specifically, how do you do this when IP spaces are controlled by various unfriendly countries around the world? Politics aside, the required technical coordination would be a nightmare. We can barely handle BGP without conflicts as-is.
IPv4 space is also quite limited, and new devices are popping onto networks all the time. I'm not even sure a IP time window is feasible without a full move to IPv6 - something that policy makers have been trying to push on for years without success.
IPv4 space is also quite limited, and new devices are popping onto networks all the time. I'm not even sure a IP time window is feasible without a full move to IPv6 - something that policy makers have been trying to push on for years without success.