Not exactly.<p>6in4 gives IPv4 hosts IPv6 addresses which means we only have to upgrade all the edges, but we still have to upgrade <i>all</i> of them.<p>What I propose (effectively) gives IPv6 (though I should call it something else) hosts IPv4 addresses: the exact opposite. You don&#x27;t have to upgrade anything except the user&#x27;s web browser (which clearly took less than 20 years).