U21.hk is tracked by us since April, 2011. Over the time it has been ranked as high as 413 999 in the world. It was owned by several entities, from company english name (it should be the same as the registered/corporation name on your business register certificate or relevant documents): the hong kong federation of youth groups to THE HONG KONG FEDERATION OF YOUTH GROUPS, it was hosted by Netfront Information Technology Limited, Microsoft Corporation and others. While HKDNR was its first registrar, now it is moved to Hong Kong Domain Name Registration Company Limited.

U21 has a high Google pagerank and bad results in terms of Yandex topical citation index. We found that U21.hk is poorly ‘socialized’ in respect to any social network. According to Siteadvisor and Google safe browsing analytics, U21.hk is quite a safe domain with no visitor reviews.