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.

14 hosts · 363 ms

HostCertsFirst seenLast seenDNS
coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
ex2.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
owa.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
coc.coeo-inkasso.de 5 2026-05-15 2026-09-12 ok
k5-gewinnspiel.coeo-inkasso.de 5 2026-05-08 2026-09-05 ok
mail.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
autodiscover.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
neuerserver.coeo-inkasso.de 5 2026-05-03 2026-08-31 ok
mta-sts.coeo-inkasso.de 5 2026-04-23 2026-08-21 ok
t.coeo-inkasso.de 5 2026-05-02 2026-08-30 ok
coeo-test.coeo-inkasso.de 5 2026-05-16 2026-09-13 ok
sunzinet-test.coeo-inkasso.de 4 2026-04-19 2026-08-17 ok
www.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok
ex.coeo-inkasso.de 2 2025-09-12 2026-08-31 ok

Programmatic access, with DNS A records: API GET /v1/hosts/coeo-inkasso.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/coeo-inkasso.de.