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Websites using HSTS

734,658 websites detected · Updated Oct 4, 2026

What is HSTS?

HSTS is a technology in the Security category. Hunter detects it on 734,658 websites.

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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
- 20 email addresses
2
wordpress.org
Technology, Information and Internet 173 email addresses
3
cloudflare.com
Computer and Network Security 389 email addresses
4
github.com
Software Development 4,326 email addresses
5
cdnjs.com
IT Services and IT Consulting 2 email addresses
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You have 734,658 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%

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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Free plan: 25 domain searches a month. No credit card.

Who uses HSTS

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

By industry

Industry Websites
Professional Services 66,952
Technology, Information and Media 60,707
Manufacturing 35,654
Retail 27,596
Consumer Services 21,205
Entertainment Providers 21,036
Financial Services 16,560
Accommodation Services 14,634
Hospitals and Health Care 14,553
Education 13,157
Administrative and Support Services 11,411
Government Administration 10,803

By country

Country Websites
United States of America 192,047
United Kingdom of Great Britain and Northern Ireland 39,087
Germany 38,648
France 26,857
Canada 23,284
Netherlands 18,583
Australia 11,695
Switzerland 9,488
Spain 8,617
India 7,267
Brazil 6,189
Russian Federation 5,957

HSTS by country

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

HSTS FAQs

Browse every technology

Hunter detects HSTS on 734,658 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 PHP.

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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