.mx is the Internet country code top-level domain (ccTLD) for Mexico, which in 2009 was re-opened to new registrations by NIC México. In 2009, the .mx ccTLD was rolled out in three steps: After the three phases, .mx registrations was opened to the public.

Second-level domains

Up to August 2009 domain registrations besides .MX, consist of third-level names beneath second-level names which parallel some of the top-level domains: Currently second level domains can be registered directly under .mx. On 30 April 2009, second level domain registrations were 0.06% of the total. A month later the value was up to 4.9% On 30 April 2010, second level registrations were 21.4% of the total.