This week, the Internet reached a turning point in its history that presents a wide-ranging set of implications: from future electronic device design to law enforcement tactics — even to online advertising. Simply put, it has depleted the pool of addresses available under Internet Protocol version 4, or IPv4. The Internet Assigned Numbers Authority, operated by ICANN, doled out the last IPv4 addresses this week to Regional Internet Registries in a public ceremony. The RIRs are expected to distribute the remaining addresses in short order.