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.

8 hosts · 263 ms

HostCertsFirst seenLast seen
chat-staging.catella.de 1 2026-02-05 2026-02-05
team.catella.de 73 2025-06-20 2026-06-01
mta-sts.catella.de 3 2026-04-14 2026-09-03
chat.catella.de 4 2026-02-07 2026-10-05
connect.catella.de 9 2026-05-05 2026-10-07
chat-dev.catella.de 2 2026-02-25 2026-06-20
view.catella.de 1 2026-01-21 2026-01-21
www.catella.de 9 2026-05-25 2026-09-20

Programmatic access: API GET /v1/hosts/catella.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/catella.de.