portal.yu.ac.kr
portal.yu.co
portal.yu.io
portal.yu.us
portal.yu.de
portal.yu.at
portal.yu.nz
portal.yu.be
portal.yu.cl
portal.yu.se
portal.yu.si
portal.yu.ею
portal.yu.ad
portal.yu.ua
portal.yu.gw
portal.yu.рф
portal.yu.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.