sec.or.kr
sec.co
sec.io
sec.us
sec.de
sec.at
sec.nz
sec.be
sec.cl
sec.se
sec.si
sec.ею
sec.ad
sec.ua
sec.gw
sec.рф
sec.co.us

co.us

Extension: .us

.us is the country-code TLD for United States.

Learn more about .us at IANA or Wikipedia, or view all top-level domains.