Classe O 21

fr

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Classe O 21

Quality:

O 21-class submarine - class of submarines built for the Royal Netherlands Navy. Article “Classe O 21” in French Wikipedia has 10.2 points for quality (as of July 1, 2025). The article contains 1 references and 8 sections.

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

Since the creation of article “Classe O 21”, its content was written by 5 registered users of French Wikipedia and edited by 43 registered Wikipedia users in all languages.

The article is cited 45 times in French Wikipedia and cited 337 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (French): #61014 in October 2020
  • Global: #66648 in November 2021

The highest popularity rank from 2008:

  • Local (French): #520121 in July 2023
  • Global: #947704 in November 2021

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)
O 21-class submarine
44.5319
2German (de)
O-21-Klasse
20.3061
3Finnish (fi)
O 21 -luokka
11.8919
4French (fr)
Classe O 21
10.1786
5Polish (pl)
Okręty podwodne typu O 21
8.2417
6Ukrainian (uk)
Підводні човни типу O 21
6.9403
7Arabic (ar)
غواصة فئة أوه 21
3.1346
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 "Classe O 21" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
O 21-class submarine
85 386
2Polish (pl)
Okręty podwodne typu O 21
3 023
3German (de)
O-21-Klasse
2 815
4French (fr)
Classe O 21
1 038
5Arabic (ar)
غواصة فئة أوه 21
522
6Finnish (fi)
O 21 -luokka
227
7Ukrainian (uk)
Підводні човни типу O 21
221
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 "Classe O 21" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
O 21-class submarine
830
2German (de)
O-21-Klasse
40
3Polish (pl)
Okręty podwodne typu O 21
21
4Ukrainian (uk)
Підводні човни типу O 21
16
5French (fr)
Classe O 21
12
6Arabic (ar)
غواصة فئة أوه 21
10
7Finnish (fi)
O 21 -luokka
4
More...

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

The highest AI

Language versions of the article "Classe O 21" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
O 21-class submarine
20
2German (de)
O-21-Klasse
10
3French (fr)
Classe O 21
5
4Arabic (ar)
غواصة فئة أوه 21
3
5Polish (pl)
Okręty podwodne typu O 21
3
6Finnish (fi)
O 21 -luokka
1
7Ukrainian (uk)
Підводні човни типу O 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 "Classe O 21" with the highest AI in June 2025
#LanguageAI awardRelative AI
1Arabic (ar)
غواصة فئة أوه 21
0
2German (de)
O-21-Klasse
0
3English (en)
O 21-class submarine
0
4Finnish (fi)
O 21 -luokka
0
5French (fr)
Classe O 21
0
6Polish (pl)
Okręty podwodne typu O 21
0
7Ukrainian (uk)
Підводні човни типу O 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 "Classe O 21" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
O 21-class submarine
128
2Ukrainian (uk)
Підводні човни типу O 21
106
3French (fr)
Classe O 21
45
4Finnish (fi)
O 21 -luokka
26
5Polish (pl)
Okręty podwodne typu O 21
24
6Arabic (ar)
غواصة فئة أوه 21
4
7German (de)
O-21-Klasse
4
More...

Scores

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

Quality measures

Interwikis

#LanguageValue
arArabic
غواصة فئة أوه 21
deGerman
O-21-Klasse
enEnglish
O 21-class submarine
fiFinnish
O 21 -luokka
frFrench
Classe O 21
plPolish
Okręty podwodne typu O 21
ukUkrainian
Підводні човни типу O 21

Popularity rank trends

Best Rank French:
#520121
07.2023
Global:
#947704
11.2021

AI rank trends

Best Rank French:
#61014
10.2020
Global:
#66648
11.2021

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on O 21-class submarine from Wikipedia articles about Type VII submarine, O 19-class submarine, T-class submarine, U-class submarine and Dolfijn-class submarine. Whereas reading the article about O 21-class submarine people most often go to Wikipedia articles on Dolfijn-class submarine, O 19-class submarine, HNLMS O 21, UD-5 and UD-3.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 5 March 2026

On 5 March 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Iran, Ali Khamenei, 2026 Iran war, Jeffrey Epstein, Kurds, Strait of Hormuz, Yakovlev Yak-130, Donald Trump, Azerbaijan, Kristi Noem.

In French Wikipedia the most popular articles on that day were: Violette Leduc, Femtogo, Soudan du Sud, XXX, Iran, Adriana Karembeu, Conflit américano-israélo-iranien de 2026, Erica (série télévisée), Michel-Ange, Catherine Vautrin.

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