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.

13 hosts · 251 ms

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HostCertsFirst seenLast seen
zusammen.de 7 2026-04-21 2026-09-03
pic.zusammen.de 2 2025-07-24 2026-06-11
stc.zusammen.de 3 2026-03-05 2026-06-11
pic.stage.zusammen.de 5 2025-07-09 2026-06-11
stc.stage.zusammen.de 4 2026-03-05 2026-06-11
pcon.stage.zusammen.de 2 2025-07-10 2026-06-11
mail.zusammen.de 4 2026-04-21 2026-08-19
crm.zusammen.de 5 2025-07-24 2026-07-08
pcon.zusammen.de 2 2025-07-16 2026-06-11
test.zusammen.de 4 2026-04-21 2026-08-19
www.zusammen.de 18 2026-04-21 2026-09-01
unstable.www.zusammen.de 4 2026-04-21 2026-08-19
test.www.zusammen.de 4 2026-04-21 2026-08-19

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