KOI8-RU

KOI8-RU is an 8-bit character encoding, designed to cover Russian, Ukrainian, and Belarusian which use a Cyrillic alphabet. It is closely related to KOI8-R, which covers Russian and Bulgarian, but replaces ten box drawing characters with five Ukrainian and Belarusian letters Ґ, Є, І, Ї, and Ў in both upper case and lower case. It is even more closely related to KOI8-U, which does not include Ў but otherwise makes the same replacements. The additional letter allocations are matched by KOI8-E, except for Ґ which is added to KOI8-F.

KOI8-RU
Language(s)Belarusian, Ukrainian, Russian, Bulgarian
Classification8-bit KOI, extended ASCII
ExtendsKOI8-B
Based onKOI8-U, KOI8-R
Other related encoding(s)KOI8-E, KOI8-F

In IBM, KOI8-RU is assigned code page/CCSID 1167.[1][2]

KOI8 remains much more commonly used than ISO 8859-5, which never really caught on. Another common Cyrillic character encoding is Windows-1251. In the future, both may eventually give way to Unicode.

KOI8 stands for Kod Obmena Informatsiey, 8 bit (Russian: Код Обмена Информацией, 8 бит) which means "Code for Information Exchange, 8 bit".

The KOI8 character sets have the property that the Russian Cyrillic letters are in pseudo-Roman order rather than the natural Cyrillic alphabetical order as in ISO 8859-5. Although this may seem unnatural, it has the useful property that if the eighth bit is stripped, the text can still be read (or at least deciphered) in case-reversed transliteration on an ordinary ASCII terminal. For instance, "Русский Текст" in KOI8-RU becomes rUSSKIJ tEKST ("Russian Text") if the 8th bit is stripped.

Character set

The following table shows the KOI8-RU encoding. Each character is shown with its equivalent Unicode code point.

KOI8-RU[3][4][5]
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_
0
1_
16
2_
32		 SP
0020		 !
0021		 "
0022		 #
0023		 $
0024		 %
0025		 &
0026		 '
0027		 (
0028		 )
0029		 *
002A		 +
002B		 ,
002C		 -
002D		 .
002E		 /
002F
3_
48		 0
0030		 1
0031		 2
0032		 3
0033		 4
0034		 5
0035		 6
0036		 7
0037		 8
0038		 9
0039		 :
003A		 ;
003B		 <
003C		 =
003D		 >
003E		 ?
003F
4_
64		 @
0040		 A
0041		 B
0042		 C
0043		 D
0044		 E
0045		 F
0046		 G
0047		 H
0048		 I
0049		 J
004A		 K
004B		 L
004C		 M
004D		 N
004E		 O
004F
5_
80		 P
0050		 Q
0051		 R
0052		 S
0053		 T
0054		 U
0055		 V
0056		 W
0057		 X
0058		 Y
0059		 Z
005A		 [
005B		 \
005C		 ]
005D		 ^
005E		 _
005F
6_
96		 `
0060		 a
0061		 b
0062		 c
0063		 d
0064		 e
0065		 f
0066		 g
0067		 h
0068		 i
0069		 j
006A		 k
006B		 l
006C		 m
006D		 n
006E		 o
006F
7_
112		 p
0070		 q
0071		 r
0072		 s
0073		 t
0074		 u
0075		 v
0076		 w
0077		 x
0078		 y
0079		 z
007A		 {
007B		 |
007C		 }
007D		 ~
007E
8_
128		 ─
2500		 │
2502		 ┌
250C		 ┐
2510		 └
2514		 ┘
2518		 ├
251C		 ┤
2524		 ┬
252C		 ┴
2534		 ┼
253C		 ▀
2580		 ▄
2584		 █
2588		 ▌
258C		 ▐
2590
9_
144		 ░
2591		 ▒
2592		 ▓
2593		 “
201C		 ■
25A0		 ∙
2219		 ”
201D		 —
2014		 №
2116		 ™
2122		 NBSP
00A0		 »
00BB		 ®
00AE		 «
00AB		 ·
00B7		 ¤
00A4
A_
160		 ═
2550		 ║
2551		 ╒
2552		 ё
0451		 є
0454		 ╔
2554		 і
0456		 ї
0457		 ╗
2557		 ╘
2558		 ╙
2559		 ╚
255A		 ╛
255B		 ґ
0491		 ў
045E		 ╞
255E
B_
176		 ╟
255F		 ╠
2560		 ╡
2561		 Ё
0401		 Є
0404		 ╣
2563		 І
0406		 Ї
0407		 ╦
2566		 ╧
2567		 ╨
2568		 ╩
2569		 ╪
256A		 Ґ
0490		 Ў
040E		 ©
00A9
C_
192		 ю
044E		 а
0430		 б
0431		 ц
0446		 д
0434		 е
0435		 ф
0444		 г
0433		 х
0445		 и
0438		 й
0439		 к
043A		 л
043B		 м
043C		 н
043D		 о
043E
D_
208		 п
043F		 я
044F		 р
0440		 с
0441		 т
0442		 у
0443		 ж
0436		 в
0432		 ь
044C		 ы
044B		 з
0437		 ш
0448		 э
044D		 щ
0449		 ч
0447		 ъ
044A
E_
224		 Ю
042E		 А
0410		 Б
0411		 Ц
0426		 Д
0414		 Е
0415		 Ф
0424		 Г
0413		 Х
0425		 И
0418		 Й
0419		 К
041A		 Л
041B		 М
041C		 Н
041D		 О
041E
F_
240		 П
041F		 Я
042F		 Р
0420		 С
0421		 Т
0422		 У
0423		 Ж
0416		 В
0412		 Ь
042C		 Ы
042B		 З
0417		 Ш
0428		 Э
042D		 Щ
0429		 Ч
0427		 Ъ
042A

  Letter   Number   Punctuation   Symbol   Other   Undefined   Differences from KOI8-R


Although RFC 2319 says that character 0x95 should be U+2219 (∙), it may also be U+2022 (•) to match the bullet character in Windows-1251.

Some references have a typo and incorrectly state that character 0xB4 is U+0403, rather than the correct U+0404. This typo is present in Appendix A of RFC 2319 (but the table in the main text of the RFC gives the correct mapping).

See also

References
  1. "Code page 1167 information document". Archived from the original on 2017-01-16.
  2. "CCSID 1167 information document". Archived from the original on 2016-03-27.
  3. Leisher, Mark (1999-12-20), KOI8-RU Belorusian/Ukrainian Cyrillic to Unicode 2.1 mapping table, KOI8RU.TXT
  4. Code Page CPGID 01167 (pdf) (PDF), IBM
  5. Code Page CPGID 01167 (txt), IBM
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