U

.ua
The Internet country code top-level domain (ccTLD) for Ukraine (Ukrayina)

.ug
The Internet country code top-level domain (ccTLD) for Uganda

.uk
The Internet country code top-level domain (ccTLD) for United Kingdom

.um
The Internet country code top-level domain (ccTLD) for United States minor outlying islands

.us
The Internet country code top-level domain (ccTLD) for United States of America (USA)

.uy
The Internet country code top-level domain (ccTLD) for Uruguay

.uz
The Internet country code top-level domain (ccTLD) for Uzbekistan (Uzbekiston)