17,428 websites using OpenSSL (2026) • Hunter

The websites using OpenSSL

A sample of the websites Hunter detects OpenSSL on, ordered by web popularity.

	Domain name	Industry
1	cloudflare.com	Computer and Network Security	436 email addresses
2	github.com	Software Development	4,735 email addresses
3	godaddy.com	Technology, Information and Internet	2,558 email addresses
4	amazon.co.jp	Software Development	670 email addresses
5	ibm.com	IT Services and IT Consulting	196,208 email addresses
6	bloomberg.com	Financial Services	177 email addresses
7	openssl.org	Non-profit Organizations	89 email addresses
8	phoca.cz	Mining	4 email addresses
9	tirerack.com	Motor Vehicle Manufacturing	271 email addresses
10	cisco.com	Software Development	101,563 email addresses
11	namex.com	-	1 email address
12	mapquest.com	Technology, Information and Internet	15 email addresses
13	netflix.com	Entertainment Providers	8,808 email addresses
14	redhat.com	Software Development	17,242 email addresses
15	digicert.com	Computer and Network Security	1,241 email addresses
16	vmware.com	Software Development	1,877 email addresses
17	hpe.com	IT Services and IT Consulting	7,697 email addresses
18	gimp.org	Software Development	276 email addresses
19	verizon.com	IT Services and IT Consulting	23,234 email addresses
20	china.com.cn	-	90 email addresses
21	sectigo.com	Software Development	112 email addresses
22	dmarc.org	-	6 email addresses
23	amd.com	Semiconductor Manufacturing	25,638 email addresses
24	wiley.com	Book and Periodical Publishing	2,977 email addresses
25	nokia.com	Telecommunications	33,061 email addresses
26	lwn.net	Technology, Information and Media	34 email addresses
27	synopsys.com	Software Development	15,205 email addresses
28	rockstargames.com	Computer Games	3,488 email addresses
29	cygwin.com	-	534 email addresses
30	utexas.edu	Higher Education	11,400 email addresses
31	ge.com	Industrial Machinery Manufacturing	10,598 email addresses
32	f5.com	IT Services and IT Consulting	6,495 email addresses
33	jvzoo.com	Technology, Information and Internet	11 email addresses
34	eviden.com	IT Services and IT Consulting	2,971 email addresses
35	se.com	Automation Machinery Manufacturing	13,471 email addresses
36	paloaltonetworks.com	Computer and Network Security	1,405 email addresses
37	geonames.org	-	15 email addresses
38	cyberduck.io	-	3 email addresses
39	blackberry.com	Software Development	4,589 email addresses
40	alteryx.com	Software Development	1,178 email addresses
41	shopclues.com	Technology, Information and Internet	76 email addresses
42	adp.com	Human Resources Services	63,985 email addresses
43	instructure.com	E-Learning Providers	1,166 email addresses
44	persistent.com	IT Services and IT Consulting	12,284 email addresses
45	bp.com	Oil and Gas	17,208 email addresses
46	xerox.com	Business Consulting and Services	34,167 email addresses
47	miniorange.com	Software Development	32 email addresses
48	tug.org	-	228 email addresses
49	jibbering.com	-	1 email address
50	deloitte.com	Business Consulting and Services	108,581 email addresses

You have 17,428 sites. Now reach the people.

Hunter already holds email addresses at all 50 websites listed above.

Amanda S. · Director Solutions Cloudflare

a****@cloudflare.com 84%
Alaine N. · Director of Events GitHub

a****@github.com 85%
Jared S. · Chief Strategy Officer GoDaddy

j****@godaddy.com 98%

Real people at the websites listed above. Only the part before the @ is hidden here — the company domain is the real one.

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Who uses OpenSSL

Websites running OpenSSL, counted by industry and by country. Only the largest groups are shown.

By industry

Industry	Websites
Professional Services	1,240
Technology, Information and Media	1,194
Manufacturing	571
Education	424
Consumer Services	399
Entertainment Providers	337
Government Administration	296
Retail	254
Financial Services	235
Hospitals and Health Care	230
Administrative and Support Services	225
Accommodation Services	210

By country

Country	Websites
United States	3,171
United Kingdom	578
Canada	444
Germany	443
Japan	406
France	276
India	275
Netherlands	249
Spain	221
Russia	214
Brazil	202
Norway	194

OpenSSL by country

The countries where we detected enough OpenSSL websites to rank them.

United States of America (3,171)
United Kingdom of Great Britain and Northern Ireland (578)
Canada (444)
Germany (443)
Japan (406)
France (276)
India (275)
Netherlands (249)
Spain (221)
Russian Federation (214)
Brazil (202)
Norway (194)

OpenSSL FAQs

Browse every technology

Hunter detects OpenSSL on 17,428 websites. The figure comes from Hunter's own crawl of company websites and is rebuilt every night, so it moves as sites adopt and drop the technology.

The table on this page is a sample of the websites running OpenSSL, ordered by web popularity, with the industries they are in and how many email addresses Hunter holds for each. Create a free account to search any of them and see the addresses.

The websites Hunter detects OpenSSL on most often also run Apache HTTP Server, PHP and jQuery.

OpenSSL is one of the Authentication Services technologies Hunter tracks. Others it detects widely include reCAPTCHA, Gravatar and Google Sign-in.

Yes — that is what Hunter is for. The last column of the table shows how many email addresses Hunter already holds for a website, where it has found any. Sign up to see the addresses themselves, with the name and job title of the person behind each one.

Websites using OpenSSL

What is OpenSSL?

The websites using OpenSSL

You have 17,428 sites. Now reach the people.

Who uses OpenSSL

By industry

By country

OpenSSL by country

OpenSSL FAQs

Websites using OpenSSL

What is OpenSSL?

The websites using OpenSSL

Commonly used alongside OpenSSL

You have 17,428 sites. Now reach the people.

Alternatives to OpenSSL

Who uses OpenSSL

By industry

By country

OpenSSL by country

OpenSSL FAQs

How many websites use OpenSSL?

Which websites use OpenSSL?

What is commonly used alongside OpenSSL?

What are the alternatives to OpenSSL?

Can I find email addresses at the companies using OpenSSL?

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