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.

3 hosts · 192 ms

HostCertsFirst seenLast seenDNS
werkenbijachmea.nl 5 2026-06-04 2026-10-03 ok
collega.werkenbijachmea.nl 12 2026-05-14 2026-09-09 ok
www.werkenbijachmea.nl 13 2026-05-19 2026-10-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/werkenbijachmea.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/werkenbijachmea.nl.