The "root servers" in question -- 13 computers located mostly in the United States -- are the Internet's master directories. They tell Web browsers and e-mail programs how to direct traffic, and Internet users the world over interact with them every day, though most without knowing it. Robert Shaw, an policy adviser with the Geneva-based International Telecommunication Union, said he understood the basis for the U.S. decision: Root servers and other address-resolving computers lower down the traffic-management chain are vital and merit protecting just as much as cities, water supplies and highways. "Many governments are legitimately concerned that another country has ultimate control of basically their communications infrastructure," he said. Some countries have pressed to move oversight of the root servers to an international body such as the ITU, a United Nations group.
Though physically in private hands, the root servers contain government-approved lists of the 260 or so Internet suffixes, such as ".com," ".net" and country designators like ".fr" for France or ".no" for Norway. In 1998, the Commerce Department selected a private organization with international board members, the Internet Corporation for Assigned Names and Numbers, to decide what goes on those lists. But Thursday's declaration means the department will keep control over that process rather than ceding it to ICANN as originally intended, though the United States said ICANN would retain day-to-day operational control.