Dot mobi is a top-level domain (TLD) extension created in 2005 by the Internet Corporation for Assigned Names and Numbers (ICANN). Domain names with the .mobi extension are managed by mTLD global registry. The entire system was created, backed, and financially sponsored by sponsors in many different fields including mobile phones, internet service providers, search engines, mobile network providers, and domain content providers. Each of the creators and sponsors below holds one seat each on the mTLD global registry board, which manages the dot mobi domain extensions.

Search engine giant Google supports mTLD in its objective of creating the standards and practices governing the development of .mobi domain sites. Google also supports the development of dot mobi sites because developing just one such site will lead to increased use of web content optimized for the mobile internet.

Global computer technology corporation Microsoft believes that mTLD and the dot mobi domain extensions will have a huge impact on both the internet and mobile world.

Mobile phone creators and providers of mobile networks such as Nokia, Samsung, Ericsson, Vodafone, and T-Mobile believe that the joint venture they sponsored in mTLD will provide mobile phone users with a better internet experience and that developing dot mobi domain extensions will bridge the gap between internet and mobile phone users.

International mobile phone creators and network providers Telefonica moviles and Telecom Italia mobile hope mTLD can join the almost one billion internet users with the two billion mobile users with the development of .mobi domain extensions.

Hong Kong-based commercial conglomerate Hutchison Whampoa belives mTLD and the development of dot mobi domain extensions will create mobile friendly internet content and services to customers around the world.

Other sponsors and creators of dot mobi domain extensions and members of the board on mTLD include Orascom Telecom, GSM Association, Syniverse Technologies, and Visa.