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 letter 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
Classification	8-bit KOI, extended ASCII
Extends	KOI8-B
Based on	KOI8-U, KOI8-R
Other related encoding(s)	KOI8-E, KOI8-F

In IBM, KOI8-RU is assigned code page/CCSID 1167.

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, "Код Обмена Информацией" in KOI8-RU becomes kOD oBMENA iNFORMACIEJ (the Russian meaning of the "KOI" acronym) 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

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

0x

1x

2x

SP

!

"

#

$

%

&

'

(

)

*

+

,

-

.

/

3x

0

1

2

3

4

5

6

7

8

9

:

;

<

=

>

?

4x

@

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

5x

P

Q

R

S

T

U

V

W

X

Y

Z

[

\

]

^

_

6x

`

a

b

c

d

e

f

g

h

i

j

k

l

m

n

o

7x

p

q

r

s

t

u

v

w

x

y

z

{

|

}

~

8x

─ 2500

│ 2502

┌ 250C

┐ 2510

└ 2514

┘ 2518

├ 251C

┤ 2524

┬ 252C

┴ 2534

┼ 253C

▀ 2580

▄ 2584

█ 2588

▌ 258C

▐ 2590

9x

░ 2591

▒ 2592

▓ 2593

“ 201C

■ 25A0

∙ 2219

” 201D

— 2014

№ 2116

™ 2122

NBSP

» 00BB

® 00AE

« 00AB

· 00B7

¤ 00A4

Ax

═ 2550

║ 2551

╒ 2552

ё 0451

є 0454

╔ 2554

і 0456

ї 0457

╗ 2557

╘ 2558

╙ 2559

╚ 255A

╛ 255B

ґ 0491

ў 045E

╞ 255E

Bx

╟ 255F

╠ 2560

╡ 2561

Ё 0401

Є 0404

╣ 2563

І 0406

Ї 0407

╦ 2566

╧ 2567

╨ 2568

╩ 2569

╪ 256A

Ґ 0490

Ў 040E

© 00A9

Cx

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

Dx

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

Ex

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

Fx

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

  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

• KOI character encodings

External links

• Nechayev, Valentin (2013) [2001]. "Review of 8-bit Cyrillic encodings universe". Archived from the original on 2016-12-05. Retrieved 2016-12-05.