Windows-1251
Windows-1251 is an 8-bit character encoding, designed to cover languages that use the Cyrillic script such as Russian, Ukrainian, Belarusian, Bulgarian, Serbian Cyrillic, Macedonian and other languages.
On the web, it is the second most-used single-byte character encoding, and most used of the single-byte encodings supporting Cyrillic., 0.3% of all websites use Windows-1251. It is by far mostly used for Russian, while a small minority of Russian websites use it, with 94.6% of Russian websites using UTF-8, and the legacy 8-bit encoding is distant second. In Linux, the encoding is known as cp1251. IBM uses code page 1251 for Windows-1251.
Windows-1251 and KOI8-R are much more commonly used than ISO 8859-5. In contrast to Windows-1252 and ISO 8859-1, Windows-1251 is not closely related to ISO 8859-5.
Unicode is preferred to Windows-1251 or other Cyrillic encodings in modern applications, especially on the Internet, making UTF-8 the dominant encoding for web pages.The following table shows Windows-1251. Each character is shown with its Unicode equivalent and its Alt code.KZ-1048
An altered version of Windows-1251 was standardised in Kazakhstan as Kazakh standard STRK1048, and is known by the label. It differs in the rows shown below:Code Page 1174 is another variant created for the Kazakh language, which matches Windows-1251 for the Russian subset of the Cyrillic letters. It differs from KZ-1048 by moving the Cyrillic letter Shha from 8E/9E to 8A/9A.Latvian variant
Windows Latvian + Russian is a modification of Windows-1251 to support the Latvian language. It uses the letter Ō/ō, abolished in 1946 but still used in the Latgalian language while it lacks the letter Ŗ/ŗ.Finnish variant
Windows Cyrillic + Finnish is a modification of Windows-1251 that was used by Paratype to cover the Finnish language. This encoding is supported by FontLab Studio 5. This variant is missing the letters Š and Ž which are used in loanwords in Finnish and can be replaced by the digraphs SH and ZH.Amiga variant
Russian Amiga OS systems used a version of code page 1251 which matches Windows-1251 for the Russian subset of the Cyrillic letters, but otherwise mostly follows ISO-8859-1. This version is known as Amiga-1251, under which name it is registered with the IANA.