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Websites using HSTS

778,363 websites detected · Updated Nov 15, 2026

What is HSTS?

HSTS is a technology in the Security category. 778,363 websites use HSTS, detected by Hunter on Nov 15, 2026.

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The websites using HSTS

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

Domain name Industry
1
messenger.com
- 22 email addresses
2
wordpress.org
Technology, Information and Internet 172 email addresses
3
cloudflare.com
Computer and Network Security 436 email addresses
4
github.com
Software Development 4,760 email addresses
5
cdnjs.com
IT Services and IT Consulting 1 email address
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You have 778,363 sites. Now reach the people.

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

  • Matthew M. · Entrepreneur WordPress

    99%

  • Amanda S. · Director Solutions Cloudflare

    84%

  • Alaine N. · Director of Events GitHub

    85%

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 HSTS

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

By industry

Industry Websites
Professional Services 73,827
Technology, Information and Media 66,254
Manufacturing 38,843
Retail 31,112
Consumer Services 24,098
Entertainment Providers 23,384
Financial Services 17,810
Accommodation Services 16,428
Hospitals and Health Care 16,166
Education 14,875
Administrative and Support Services 12,667
Government Administration 11,852

By country

Country Websites
United States 207,502
United Kingdom 41,720
Germany 40,502
France 27,893
Canada 24,635
Netherlands 19,411
Australia 13,090
Switzerland 10,186
Spain 9,308
India 7,922
Brazil 6,808
Sweden 6,138

HSTS by country

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

HSTS FAQs

Browse every technology

Hunter detects HSTS on 778,363 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 HSTS, 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 HSTS on most often also run jQuery, HTTP/3 and Cloudflare.

HSTS is one of the Security technologies Hunter tracks. Others it detects widely include Cloudflare Bot Management, Sucuri and DDoS-Guard.

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.
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