Is Internet2 or ZeroSSL more popular?

ZeroSSL is used by more websites in our catalog: 978 use Internet2 and 2,425 use ZeroSSL.

Does Internet2 or ZeroSSL have higher-authority sites?

Internet2 sites have the higher median Ahrefs Domain Rating (Internet2: 76, ZeroSSL: 23).

Is Internet2 or ZeroSSL growing faster?

Between 2026-06 and 2026-07, Internet2 went from 0.16% to 0.11% of all tracked sites, while ZeroSSL went from 0.29% to 0.28%. ZeroSSL is gaining ground faster in our index.

Can a site use both Internet2 and ZeroSSL?

No. A site runs a single SSL certificate authority, so Internet2 and ZeroSSL are mutually exclusive.

Where does this Internet2 vs ZeroSSL 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.

Internet2 vs ZeroSSL — Site Stats Database

Internet2 vs ZeroSSL

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	Internet2	ZeroSSL
Websites	978	2,425
Market share	0.12%	0.29%
Share of top 10K sites	1.5%	0.16%

Rank	#12	#9

Median DR	76	23

Average DR	72	28

Median keywords	5,101	1,066

Median referring domains	2,226	433

Median domain age	34 yrs	11 yrs

Average domain age	31 yrs	13 yrs

Average monthly traffic	817,556	66,319

Combined monthly traffic	799,569,907	160,824,401

si.edu
LanguageEnglish
DR (Ahrefs)91
Total Keywords1,137,159
Referring Domains237,359
Domain Age34 yrs
Traffic (Jun 2026)60,547,423
Traffic Trend
TechnologyInternet2
cornell.edu
LanguageEnglish
DR (Ahrefs)92
Total Keywords1,692,749
Referring Domains372,628
Domain Age40 yrs
Traffic (Jun 2026)54,727,724
Traffic Trend
Technology
stanford.edu
LanguageEnglish
DR (Ahrefs)92
Total Keywords1,198,840
Referring Domains511,286
Domain Age40 yrs
Traffic (Jun 2026)45,915,915
Traffic Trend
Technology
ufl.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords855,336
Referring Domains184,301
Domain Age40 yrs
Traffic (Jun 2026)18,671,974
Traffic Trend
TechnologyInternet2
umn.edu
LanguageEnglish
DR (Ahrefs)91
Total Keywords872,046
Referring Domains243,227
Domain Age39 yrs
Traffic (Jun 2026)17,043,429
Traffic Trend
TechnologyInternet2
utah.edu
LanguageEnglish
DR (Ahrefs)89
Total Keywords710,042
Referring Domains124,764
Domain Age39 yrs
Traffic (Jun 2026)14,911,220
Traffic Trend
TechnologyInternet2
mdanderson.org
LanguageEnglish
DR (Ahrefs)83
Total Keywords351,124
Referring Domains36,497
Domain Age29 yrs
Traffic (Jun 2026)14,049,960
Traffic Trend
Technology
oregonstate.edu
LanguageEnglish
DR (Ahrefs)89
Total Keywords551,866
Referring Domains107,559
Domain Age27 yrs
Traffic (Jun 2026)13,045,470
Traffic Trend
Technology
illinois.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords781,195
Referring Domains165,621
Domain Age29 yrs
Traffic (Jun 2026)12,771,348
Traffic Trend
Technology
rutgers.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords402,403
Referring Domains132,809
Domain Age41 yrs
Traffic (Jun 2026)9,973,805
Traffic Trend
Technology

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
si.edu	English	91	1,137,159	237,359	34 yrs	60,547,423		Internet2

dailymotion.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords5,631,851
Referring Domains439,650
Domain Age21 yrs
Traffic (Jun 2026)29,762,292
Traffic Trend
TechnologyZeroSSL
petfinder.com
Language
DR (Ahrefs)86
Total Keywords309,140
Referring Domains35,407
Domain Age28 yrs
Traffic (Jun 2026)17,935,968
Traffic Trend
Technology
purina.com
Language
DR (Ahrefs)80
Total Keywords279,239
Referring Domains20,198
Domain Age30 yrs
Traffic (Jun 2026)15,738,940
Traffic Trend
TechnologyZeroSSL
easemate.ai
LanguageEnglish
DR (Ahrefs)50
Total Keywords31,731
Referring Domains2,281
Domain Age1 yr
Traffic (Jun 2026)12,535,413
Traffic Trend
Technology
chinahighlights.com
LanguageEnglish
DR (Ahrefs)78
Total Keywords76,271
Referring Domains25,545
Domain Age27 yrs
Traffic (Jun 2026)7,779,761
Traffic Trend
Technology
jellycat.com
LanguageEnglish
DR (Ahrefs)71
Total Keywords82,329
Referring Domains4,508
Domain Age26 yrs
Traffic (Jun 2026)4,163,338
Traffic Trend
Technology
sf.gov
LanguageEnglish
DR (Ahrefs)83
Total Keywords125,412
Referring Domains18,090
Domain Age10 yrs
Traffic (Jun 2026)3,627,926
Traffic Trend
TechnologyZeroSSL
screener.in
LanguageEnglish
DR (Ahrefs)72
Total Keywords59,916
Referring Domains4,356
Domain Age16 yrs
Traffic (Jun 2026)2,799,998
Traffic Trend
Technology
finedictionary.com
LanguageEnglish
DR (Ahrefs)40
Total Keywords282,639
Referring Domains2,583
Domain Age13 yrs
Traffic (Jun 2026)2,352,439
Traffic Trend
Technology
kwickmenu.com
LanguageEnglish
DR (Ahrefs)76
Total Keywords120,864
Referring Domains2,786
Domain Age9 yrs
Traffic (Jun 2026)1,927,802
Traffic Trend
Technology