X.21

cs

WikiRank.net
ver. 1.6.2

X.21

Quality:

X.21 - ITU-T telecommunications interface specification. Article “X.21” in Czech Wikipedia has 5.8 points for quality (as of July 1, 2025). The article contains 0 references and 4 sections.

This article has the best quality in English Wikipedia. Also, this article is the most popular in that (Czech) language version.

Since the creation of article “X.21”, its content was written by 2 registered users of Czech Wikipedia and edited by 83 registered Wikipedia users in all languages.

The article is cited 2 times in Czech Wikipedia and cited 265 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (Czech): #27832 in June 2014
  • Global: #115525 in August 2004

The highest popularity rank from 2008:

  • Local (Czech): #147900 in February 2009
  • Global: #294613 in April 2008

There are 7 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1English (en)
X.21
16.9709
2Italian (it)
X.21
12.1342
3Arabic (ar)
X.21
8.396
4French (fr)
X.21
7.7584
5Czech (cs)
X.21
5.8233
6German (de)
X.21
4.4725
7Norwegian (Nynorsk) (nn)
X.21
2.7368
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "X.21" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
X.21
268 213
2German (de)
X.21
56 402
3French (fr)
X.21
39 314
4Italian (it)
X.21
7 030
5Czech (cs)
X.21
1 763
6Arabic (ar)
X.21
1 545
7Norwegian (Nynorsk) (nn)
X.21
1 487
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2025

The most popular language versions of the article "X.21" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
X.21
496
2German (de)
X.21
64
3French (fr)
X.21
23
4Czech (cs)
X.21
18
5Arabic (ar)
X.21
13
6Norwegian (Nynorsk) (nn)
X.21
10
7Italian (it)
X.21
9
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "X.21" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
X.21
30
2French (fr)
X.21
19
3German (de)
X.21
14
4Italian (it)
X.21
13
5Arabic (ar)
X.21
4
6Czech (cs)
X.21
2
7Norwegian (Nynorsk) (nn)
X.21
1
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2025

Language versions of the article "X.21" with the highest AI in June 2025
#LanguageAI awardRelative AI
1Arabic (ar)
X.21
0
2Czech (cs)
X.21
0
3German (de)
X.21
0
4English (en)
X.21
0
5French (fr)
X.21
0
6Italian (it)
X.21
0
7Norwegian (Nynorsk) (nn)
X.21
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "X.21" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1French (fr)
X.21
200
2English (en)
X.21
41
3German (de)
X.21
15
4Arabic (ar)
X.21
5
5Czech (cs)
X.21
2
6Italian (it)
X.21
2
7Norwegian (Nynorsk) (nn)
X.21
0
More...

Scores

Estimated value for Wikipedia:
Czech:
Global:
Popularity in June 2025:
Czech:
Global:
Popularity in all years:
Czech:
Global:
Authors in June 2025:
Czech:
Global:
Registered authors in all years:
Czech:
Global:
Citations:
Czech:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
X.21
csCzech
X.21
deGerman
X.21
enEnglish
X.21
frFrench
X.21
itItalian
X.21
nnNorwegian (Nynorsk)
X.21

Popularity rank trends

Best Rank Czech:
#147900
02.2009
Global:
#294613
04.2008

AI rank trends

Best Rank Czech:
#27832
06.2014
Global:
#115525
08.2004

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on X.21 from Wikipedia articles about X.25, OSI model, Circuit switching, Modem and RS-422. Whereas reading the article about X.21 people most often go to Wikipedia articles on RS-422, RS-232, X21, RS-423 and X.25.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

en: X.21
de: X.21
fr: X.21
it: X.21
cs: X.21
ar: X.21
nn: X.21

News from 28 January 2026

On 28 January 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2025–26 UEFA Champions League, Nipah virus, Doomsday Clock, UEFA Champions League, Elena Rybakina, Donald Trump, 2026 European Men's Handball Championship, killing of Alex Pretti, Kristi Noem, deaths in 2026.

In Czech Wikipedia the most popular articles on that day were: Petr Macinka, Kohabitace, Petr Kolář (diplomat), Petr Pavel, Filip Turek, Ondrej Nepela, Jiří Straka, Bachelor Česko, Žerotínové, Lucie Výborná.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information