Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

6 hosts · 309 ms

HostCertsFirst seenLast seenDNS
achmeafoundation.nl 2 2025-07-08 2026-06-30 ok
publicaties.achmeafoundation.nl 1 2026-07-15 2026-07-15 ok
www.achmeafoundation.nl 2 2025-07-08 2026-06-30 ok
acc.www.achmeafoundation.nl 2 2025-07-08 2026-06-30 ok
stg.www.achmeafoundation.nl 2 2025-07-08 2026-06-30 ok
1.tst.www.achmeafoundation.nl 2 2025-07-08 2026-06-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/achmeafoundation.nl (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/achmeafoundation.nl.