KOI8-R

KOI8-R

Alias(es)	cp878 (code page 878)
Language(s)	Russian, Bulgarian
Classification	8-bit KOI, extended ASCII
Extends	KOI8-B
Based on	KOI-8
Other related encoding(s)	KOI8-U, KOI8-RU

KOI8-R (RFC 1489) is an 8-bit character encoding derived from the KOI-8 encoding by the programmer Andrei Chernov in 1993 and designed to cover Russian, which uses the Russian subset of a Cyrillic script. KOI-8, on its turn, is an 8-bit extension of the KOI-7 encoding, which inherited a phonetic correspondence of Russian and Latin letters from the MTK-2 teletype code. As a result, Russian Cyrillic letters in KOI-8R are in pseudo-Latin alphabetical order rather than the normal Cyrillic one like in ISO 8859-5. Although this may seem unnatural, this has the useful effect that if the 8th bit is stripped, the text remains partially readable in any ASCII-based encoding (including KOI8-R itself) as a case-reversed transliteration. For example, "Код для обмена и обработки информации" (the Russian meaning of the "KOI" acronym) becomes kOD DLQ OBMENA I OBRABOTKI INFORMACII.

KOI-8 stands for 8-bitnyy kod dlya obmena i obrabotki informatsii (Russian: 8-битный код для обмена и обработки информации) which means "8-Bit Code for Information Interchange". In Microsoft Windows, KOI8-R is assigned the code page number 20866. In IBM, KOI8-R is assigned code page 878. KOI8-R also happens to cover Bulgarian.

It lacks proper quotation marks for these languages: both «...» and the Bulgarian „...“. Windows-1251 does support these, as well as more letters, and has thus become more popular. KOI8-R is used by less than 0.004% of websites, mostly Russian and Bulgarian. Unicode and UTF-8 is preferred to single-byte Cyrillic encodings in modern applications, Unicode contains 436 Cyrillic letters including for Old Cyrillic.

Character set

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

KOI8-R

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

⌠ 2320

■ 25A0

∙ 2219

√ 221A

≈ 2248

≤ 2264

≥ 2265

NBSP

⌡ 2321

° 00B0

² 00B2

· 00B7

÷ 00F7

Ax

═ 2550

║ 2551

╒ 2552

ё 0451

╓ 2553

╔ 2554

╕ 2555

╖ 2556

╗ 2557

╘ 2558

╙ 2559

╚ 255A

╛ 255B

╜ 255C

╝ 255D

╞ 255E

Bx

╟ 255F

╠ 2560

╡ 2561

Ё 0401

╢ 2562

╣ 2563

╤ 2564

╥ 2565

╦ 2566

╧ 2567

╨ 2568

╩ 2569

╪ 256A

╫ 256B

╬ 256C

© 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

See also

• KOI8-B, a derivation of KOI8-R with only the letter subset implemented
• KOI8-U, another derivative encoding which adds Ukrainian characters
• KOI character encodings
• RELCOM
• Windows-1251, another common Cyrillic character encoding

Further reading

• Flohr, Guido; Kiss, Gabor; Chernov, Andrey A. (2016) [2006]. "Locale::RecodeData::KOI8_R - Conversion routines for KOI8-R". CPAN libintl-perl. 1.0. Archived from the original on 2017-01-15. Retrieved 2017-01-15.
• Kostis, Kosta. "koi8-r (Russian U*IX encoding, also used by RELCOM)". 1.20. Archived from the original on 2017-01-16. Retrieved 2017-01-16.
• RFC 1489
• "KOI8-R (RFC 1489)". Kermit. Columbia University. Retrieved 2020-06-24.
• Kornai, Andras; Birnbaum, David J.; da Cruz, Frank; Davis, Bur; Fowler, George; Paine, Richard B.; Paperno, Slava; Simonsen, Keld J.; Thobe, Glenn E.; Vulis, Dimitri; van Wingen, Johan W. (1993-03-13). "CYRILLIC ENCODING FAQ Version 1.3". 1.3. Retrieved 2020-06-24.

External links

• Universal Cyrillic decoder, an online program that may help recovering Cyrillic texts with broken KOI8-R or other character encodings.
• "The Home of the KOI8-R since 1995". 1995. Retrieved 2016-12-05.
• Czyborra, Roman (1998-11-30) [1998-05-25]. "The Cyrillic Charset Soup". Archived from the original on 2016-12-03. Retrieved 2016-12-03.
• Hohlov, Yu. E. "Cyrillic Information Representation in Electronic Form - Character Set (Code Page) Tables". Archived from the original on 2016-12-05. Retrieved 2016-12-05.
• Nechayev, Valentin (2013) [2001]. "Review of 8-bit Cyrillic encodings universe". Archived from the original on 2016-12-05. Retrieved 2016-12-05.