.us is the Internet country code top-level domain (ccTLD) for the United States of America, established in 1985. Registrants of .us domains must be United States citizens, residents, or organizations, or a foreign entity with a presence in the United States. However, most registrants these days usually register for .com, .net, .org and other gTLDs rather than .us.

Originally, registrants could only register third-level domains or higher. In April 2002, second-level domains became available. The .us domain is administered by NeuStar Inc..

Second-level domains

• .ak.us: Alaska
• .al.us: Alabama
• .ar.us: Arkansas
• .az.us: Arizona
• .ca.us: California
• .co.us: Colorado
• .ct.us: Connecticut
• .dc.us: District of Columbia
• .de.us: Delaware
• .dni.us: distributed national institutes
• .fed.us: federal government agencies
• .fl.us: Florida
• .ga.us: Georgia
• .hi.us: Hawaii
• .ia.us: Iowa
• .id.us: Idaho
• .il.us: Illinois
• .in.us: Indiana
• .isa.us: interstate agencies
• .kids.us: content suitable for children under 13
• .ks.us: Kansas
• .ky.us: Kentucky
• .la.us: Louisiana
• .ma.us: Massachusetts
• .md.us: Maryland
• .me.us: Maine
• .mi.us: Michigan
• .mn.us: Minnesota
• .mo.us: Missouri
• .ms.us: Mississippi
• .mt.us: Montana
• .nc.us: North Carolina
• .nd.us: North Dakota
• .ne.us: Nebraska
• .nh.us: New Hampshire
• .nj.us: New Jersey
• .nm.us: New Mexico
• .nsn.us: native sovereign nations (federally recognized Native American tribes)
• .nv.us: Nevada
• .ny.us: New York
• .oh.us: Ohio
• .ok.us: Oklahoma
• .or.us: Oregon
• .pa.us: Pennsylvania
• .ri.us: Rhode Island
• .sc.us: South Carolina
• .sd.us: South Dakota
• .tn.us: Tennessee
• .tx.us: Texas
• .ut.us: Utah
• .vt.us: Vermont
• .va.us: Virginia
• .wa.us: Washington
• .wi.us: Wisconsin
• .wv.us: West Virginia
• .wy.us: Wyoming

Namespace within states (largely deprecated)

• <locality>.<state>.us: cities, counties, parishes, and townships
• ci.<locality>.<state>.us: city government agencies (subdomain under locality)
• co.<locality>.<state>.us: county government agencies (subdomain under locality)
• <school-name>.k12.<state>.us: public school districts
• <school-name>.pvt.k12.<state>.us: private schools
• <school-name>.cc.<state>.us: community colleges
• <school-name>.tec.<state>.us: technical and vocational schools
• <library-name>.lib.<state>.us: state, regional, city, and county libraries
• <organization-name>.state.<state>.us: state government agencies
• <organization-name>.gen.<state>.us: general independent entities (groups not fitting into the above categories)

External links

• IANA .us whois information http://www.iana.org/root-whois/us.htm
• usTLD Nexus Requirements http://www.nic.us/policies/docs/ustld_nexus_requirements.pdf - Requirements for registrants of .us domains, Portable Document Format
• Kids.us Content Policies http://www.kids.us/content_policy/content.html
• RFC 1480: The US Domain (June 1993)