⚠️ Caution: This is an early demo of our test updates for NCSC's 2025 TLS guidelines, to allow you to test against the new guidelines.

Some explanation text is still missing, out of date, or in rough draft state. Test evaluations may still change.
This URL is an active development environment and has limited availability - it may be down for hours or days.

Tests from this instance originate from different IPs than those used in production. If you use allowlisting on our production IPs, results may vary, particularly for email TLS. To include this instance, allowlist 62.204.66.0/26 and 2a00:d00:ff:162::/64.

Home

Modern Internet Standards provide for more reliability and further growth of the Internet.
Are you using them?

Test your website

Modern address? Signed domain? Secure connection? Route authorisation?

About the test

Test your email

Modern address? Anti-phishing? Secure transport? Route authorisation?

About the test

Test your connection

Modern addresses reachable?
Domain signatures validated?

About the test

News

To the news overview

Hall of Fame

30 domains with 2 x 100%
Latest entry: 11-03-2026

  1. www.workingornot.org
  2. workingornot.org
  3. analyzetls.hostingtool.org
  4. dev3.internet.nl
  5. dev2.internet.nl
  6. dev4.internet.nl
  7. dev1.internet.nl
  8. internet.nl
  9. mijn.ncsc.nl
  10. helpdesk.internet.nl

To Hall of Fame - Champions!

Tests in numbers

185 unique web domains

  1. Passed 100%: 61
  2. Failed 0-99%: 124

111 unique mail domains

  1. Passed 100%: 52
  2. Failed 0-99%: 59

2 unique connections

  1. Passed 100%: 0
  2. Failed 0-99%: 2