|Introduced||February 15, 1985|
|Intended use||Entities connected with the |
|Actual use||Low to medium popularity in the United States due to |
|Registered domains||1,715,757 (March 2016)|
|Registration restrictions||U.S. nexus requirement can be enforced by challenge but seldom is|
|Structure||2nd-level registrations allowed; originally only 3rd- or 4th-level registrations in a complex hierarchy|
|Documents||RFC 1480; USDoC agreements with Neustar|
|Dispute policies||usTLD Dispute Resolution Policy (usDRP)|
.us is the
On February 15, 1985, .us was created as the Internet's first ccTLD. Its original administrator was
Postel and his colleague Ann Westine Cooper codified the .us ccTLD's policies in December 1992 as RFC 1386 and revised them the following June in RFC 1480. Registrants could only register third-level domains or higher in a geographic and organizational hierarchy. From June 1993 to June 1997, Postel delegated the vast majority of the geographic subdomains under .us to various public and private entities. .us registrants could register with the delegated manager for the specific zone they wished to register in, but not directly with the .us administrator. In July 1997, Postel instituted a "50/500 rule" that limited each delegated manager to 500 localities maximum, 50 in a given state.
In June 1998, Postel raised the possibility of covering
On October 26, 2001,
On March 31st, 2019, The .US registry  made it clear that under its Acceptable Use Policy it would not allow the sale of opioids through the .US top level domain.