.ru is the Latin alphabet Internet country code top-level domain (ccTLD) for the Russian Federation. The .ru extension was introduced in on April 7, 1994, by the Russian registry Russian Institute for Public Networks. In 2002, the administration of .ru ccTLD were handed over to Coordination Center for TLD RU.
In September 2012, .ru ccTLD reached 4 million domain names. In November 2015, the number of .RU domain names reached 5 million.
You can register your domain name directly under .ru, or with second-level TLDs such as .com.ru, .net.ru and .org.ru. Also, there are second-level extensions for federal subjects of Russia: .mos.ru, .penza.ru, .mosreg.ru.
.ru domain names are very popular in Russia. Only Latin letters can be used in a .ru domain name, IDN isn't allowed.
.ru ranks #12 among all domain extensions, and #6 among all country-code extensions (ccTLDs). Currently, there are 3.8M registered .ru domain names. Coordination Center for TLD RU is the current registry of .ru extension.