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Websites using HSTS

770,327 websites detected · Updated Oct 25, 2026

What is HSTS?

HSTS is a technology in the Security category. 770,327 websites use HSTS, detected by Hunter on Oct 25, 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
- 20 email addresses
2
wordpress.org
Technology, Information and Internet 172 email addresses
3
cloudflare.com
Computer and Network Security 394 email addresses
4
github.com
Software Development 4,540 email addresses
5
cdnjs.com
IT Services and IT Consulting 2 email addresses
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You have 770,327 sites. Now reach the people.

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

  • Matthew M. · Entrepreneur WordPress

    99%

  • Anish P. · Head Of Sales 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 72,453
Technology, Information and Media 64,985
Manufacturing 38,380
Retail 30,808
Consumer Services 23,716
Entertainment Providers 23,048
Financial Services 17,484
Accommodation Services 16,106
Hospitals and Health Care 15,910
Education 14,612
Administrative and Support Services 12,446
Government Administration 11,653

By country

Country Websites
United States 205,230
United Kingdom 41,197
Germany 39,813
France 27,431
Canada 24,465
Netherlands 19,195
Australia 12,873
Switzerland 10,111
Spain 9,166
India 7,751
Brazil 6,667
Sweden 6,036

HSTS by country

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

Hunter detects HSTS on 770,327 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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