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.

20 hosts · 242 ms

HostCertsFirst seenLast seen
sieh-an.de 2 2026-04-12 2026-09-12
*.sieh-an.de 7 2025-09-01 2026-09-25
vapxga.sieh-an.de 2 2026-05-30 2026-08-10
*.prod.wcc.sieh-an.de 2 2025-06-24 2026-05-25
api.prod.wcc.sieh-an.de 5 2026-05-09 2026-09-06
cdn.wcc.sieh-an.de 2 2025-07-17 2026-06-16
cdn-test.wcc.sieh-an.de 1 2025-12-28 2025-12-28
*.test.wcc.sieh-an.de 2 2025-08-25 2026-07-26
api.test.wcc.sieh-an.de 5 2026-05-21 2026-09-18
shop.test.wcc.sieh-an.de 4 2026-04-20 2026-08-18
d.sieh-an.de 11 2025-07-08 2026-09-27
www.d.sieh-an.de 1 2025-07-08 2025-07-08
te.sieh-an.de 3 2025-12-29 2026-08-28
m.sieh-an.de 11 2026-01-27 2026-09-23
info.sieh-an.de 1 2026-02-09 2026-02-09
www.info.sieh-an.de 1 2026-02-09 2026-02-09
wasp.sieh-an.de 4 2026-04-19 2026-09-25
tp.sieh-an.de 2 2026-01-20 2026-08-28
link-news.sieh-an.de 5 2026-05-18 2026-09-14
wst.sieh-an.de 3 2026-05-18 2026-08-31

Programmatic access: API GET /v1/hosts/sieh-an.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/sieh-an.de.