360.com

360.com is the only number-based URL on our domain name value list, and it is one of the few domains of its kind that has made a fortune. The transaction occurred in 2015 when Qihoo CEO Zhou Hongyi intended to build a new brand that would unify and embrace all of his products and services. The audacious move cost $17 million.

360.com was sold by Vodafone, the telecommunications corporation that once produced a phone of the same name. While number-based domains are becoming less popular in the West, the acquisition was a smart move for a corporation primarily focused on the Chinese market. In China, where numbers have cultural significance, short names and digits are significantly more prevalent. As a result, the high domain name fee is completely justified.

Surprisingly, when compared to the other sites on this list, 360.com is far more popular outside of the United States. Qihoo, a leading security brand in China that sells a wide range of internet security products, owns the site. 360.com claims to be China's largest provider of Internet and mobile security products. The company claims to be a pioneer of free online security products, having been founded in 2005.

Price: $17 million