What is .mobi?
The .mobi domain name extension is the first and only top-level domain (TLD) dedicated exclusively to delivering Internet content to mobile devices, such as cell phones and PDAs. The .mobi domain name extension was created specifically to direct mobile Internet users to websites that are developed to work on these devices.
All websites that use the .mobi extension must be optimized for easy viewing on mobile devices. If a domain name ends in .mobi, the visitor can trust that the site is created for viewing on a mobile device.
Anyone can register a .mobi domain name and extend the reach of their website — a site specifically designed for viewing on mobile devices. The registrant must comply with the rules and best practices for .mobi website content, as specified in the dotMobi Mobile Web Developer's Guide.