Is Hellenic Academic and Research Institutions CA or PerfectSSL more popular?

Hellenic Academic and Research Institutions CA is used by more websites in our catalog: 1,161 use Hellenic Academic and Research Institutions CA and 141 use PerfectSSL.

Does Hellenic Academic and Research Institutions CA or PerfectSSL have higher-authority sites?

Hellenic Academic and Research Institutions CA sites have the higher median Ahrefs Domain Rating (Hellenic Academic and Research Institutions CA: 75, PerfectSSL: 32).

Is Hellenic Academic and Research Institutions CA or PerfectSSL growing faster?

Between 2026-06 and 2026-07, Hellenic Academic and Research Institutions CA went from 0.17% to 0.13% of all tracked sites, while PerfectSSL went from 0.02% to 0.02%. PerfectSSL is gaining ground faster in our index.

Can a site use both Hellenic Academic and Research Institutions CA and PerfectSSL?

No. A site runs a single SSL certificate authority, so Hellenic Academic and Research Institutions CA and PerfectSSL are mutually exclusive.

Hellenic Academic and Research Institutions CA vs PerfectSSL — Site Stats Database

Hellenic Academic and Research Institutions CA vs PerfectSSL

Q: Where does this Hellenic Academic and Research Institutions CA vs PerfectSSL data come from?

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.

A side-by-side comparison of two ssl certificate authorities, based on the 842,065 SSL Authority sites tracked by Site Stats Database.

Last updated July 1, 2026

Metric	Hellenic Academic and Research Institutions CA	PerfectSSL
Websites	1,161	141
Market share	0.14%	0.02%
Share of top 10K sites	0.00%

Share of top 100K sites	0.06%	0.01%

Rank	#11	#30

Median DR	75	32

Average DR	74	34

Median keywords	658	482

Median referring domains	5,129	554

Median domain age	26 yrs	16 yrs

Average domain age	24 yrs	17 yrs

Average monthly traffic	13,566	26,083

Combined monthly traffic	15,749,601	3,677,718

mpg.de
LanguageGerman
DR (Ahrefs)89
Total Keywords61,365
Referring Domains103,616
Domain Age
Traffic (Jun 2026)560,707
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
ucm.es
LanguageSpanish
DR (Ahrefs)84
Total Keywords21,955
Referring Domains58,616
Domain Age
Traffic (Jun 2026)520,587
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
eso.org
LanguageEnglish
DR (Ahrefs)82
Total Keywords18,717
Referring Domains32,647
Domain Age35 yrs
Traffic (Jun 2026)398,404
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
cun.es
LanguageSpanish
DR (Ahrefs)75
Total Keywords72,981
Referring Domains9,254
Domain Age
Traffic (Jun 2026)394,191
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
hal.science
LanguageEnglish
DR (Ahrefs)85
Total Keywords68,893
Referring Domains58,817
Domain Age
Traffic (Jun 2026)357,126
Traffic Trend
Technology
belgium.be
LanguageEnglish
DR (Ahrefs)90
Total Keywords12,117
Referring Domains64,675
Domain Age31 yrs
Traffic (Jun 2026)290,046
Traffic Trend
Technology
astro4edu.org
LanguageEnglish
DR (Ahrefs)48
Total Keywords15,128
Referring Domains1,030
Domain Age6 yrs
Traffic (Jun 2026)262,741
Traffic Trend
Technology
plantnet.org
LanguageEnglish
DR (Ahrefs)74
Total Keywords11,086
Referring Domains7,165
Domain Age12 yrs
Traffic (Jun 2026)234,714
Traffic Trend
Technology
bund.de
LanguageEnglish
DR (Ahrefs)94
Total Keywords99,279
Referring Domains462,466
Domain Age
Traffic (Jun 2026)224,202
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
habsburger.net
LanguageGerman
DR (Ahrefs)63
Total Keywords6,739
Referring Domains3,814
Domain Age17 yrs
Traffic (Jun 2026)188,745
Traffic Trend
Technology

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
mpg.de	German	89	61,365	103,616		560,707		Hellenic Academic and Research Institutions CA

giant-bicycles.com
LanguageEnglish
DR (Ahrefs)79
Total Keywords31,182
Referring Domains14,460
Domain Age27 yrs
Traffic (Jun 2026)1,662,799
Traffic Trend
TechnologyPerfectSSL
majstro.com
LanguageEnglish
DR (Ahrefs)37
Total Keywords131,520
Referring Domains2,709
Domain Age23 yrs
Traffic (Jun 2026)333,984
Traffic Trend
Technology
airports-guides.com
LanguageEnglish
DR (Ahrefs)42
Total Keywords44,543
Referring Domains1,482
Domain Age22 yrs
Traffic (Jun 2026)327,422
Traffic Trend
Technology
liv-cycling.com
LanguageEnglish
DR (Ahrefs)75
Total Keywords16,579
Referring Domains3,801
Domain Age13 yrs
Traffic (Jun 2026)288,744
Traffic Trend
Technology
momentum-biking.com
LanguageEnglish
DR (Ahrefs)56
Total Keywords3,599
Referring Domains912
Domain Age17 yrs
Traffic (Jun 2026)128,904
Traffic Trend
Technology
vintagerockmag.com
LanguageEnglish
DR (Ahrefs)32
Total Keywords2,847
Referring Domains748
Domain Age14 yrs
Traffic (Jun 2026)85,769
Traffic Trend
Technology
gotheborg.com
Language
DR (Ahrefs)51
Total Keywords4,721
Referring Domains1,370
Domain Age27 yrs
Traffic (Jun 2026)67,336
Traffic Trend
Technology
bridgewebs.com
LanguageEnglish
DR (Ahrefs)73
Total Keywords4,159
Referring Domains2,928
Domain Age19 yrs
Traffic (Jun 2026)66,059
Traffic Trend
Technology
silenthillmemories.net
LanguageEnglish
DR (Ahrefs)36
Total Keywords5,544
Referring Domains2,159
Domain Age19 yrs
Traffic (Jun 2026)62,845
Traffic Trend
Technology
finediningexplorer.com
LanguageEnglish
DR (Ahrefs)20
Total Keywords1,798
Referring Domains714
Domain Age18 yrs
Traffic (Jun 2026)59,464
Traffic Trend
Technology