The domain name рф (romanized as rf ) is Cyrillic country code top-level domain in the Domain Name System of the Internet for the Russian Federation. In the Domain Name System it has the ASCII DNS name xn--p1ai. The domain accepts only Cyrillic subdomain applications, and is the first Cyrillic implementation of the Internationalizing Domain Names in Applications (IDNA) system. The domain became operational on May 13, 2010.

рф (Russian: Российская Федерация) is transliterated as Rossiyskaya Federatsiya, the Russian Federation. The domain has an ascii representation of xn--p1ai derived as Punycode for use in the Domain Name System.

The domain is intended for Internet resources with names in the Russian language using Cyrillic.

A principle in the approval process of ICANN Generic Names Supporting Organization (GNSO) states that Greek and Cyrillic two-character top-level domains should not exclusively use characters that could be confused with Latin characters of identical or similar shapes — a problem that particularly limits Cyrillic choices. As such, GNSO sought to avoid the direct transcription of "ru" into Cyrillic, "ру", and common abbreviations for Russia (Russian: Россия), such as "ро", in order to avoid confusion with the Latin ccTLDs .py (Paraguay) and .po (currently^[update] unassigned). In English sources .рф can be romanized as .rf, but the latter is not a valid domain for Russia.