Find every subdomain
of a domain.

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

5 hosts · 263 ms

HostCertsFirst seenLast seen
sopg-consulting.de 2 2026-06-12 2026-09-07
formular.sopg-consulting.de 3 2026-06-29 2026-08-28
mta-sts.sopg-consulting.de 5 2026-05-29 2026-09-26
start.sopg-consulting.de 13 2026-05-23 2026-09-19
www.sopg-consulting.de 2 2026-06-12 2026-09-07

Programmatic access: API GET /v1/hosts/sopg-consulting.de (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/sopg-consulting.de.