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 · 359 ms

HostCertsFirst seenLast seenDNS
hookain.de 5 2026-05-04 2026-09-01 ok
hub.hookain.de 1 2026-10-01 2026-10-01 ok
feed.hookain.de 1 2026-09-10 2026-09-10 ok
dashboard.hookain.de 1 2026-09-11 2026-09-11 ok
staging.hookain.de 1 2026-09-04 2026-09-04 ok
mail.hookain.de 5 2026-05-06 2026-09-03 ok
webmail.hookain.de 5 2026-05-06 2026-09-03 ok
mcp.hookain.de 1 2026-09-15 2026-09-15 ok
insider.hookain.de 14 2026-06-07 2026-10-03 ok
documents.hookain.de 1 2026-09-10 2026-09-10 ok
img.kontakt.hookain.de 16 2026-05-18 2026-09-13 ok
r.kontakt.hookain.de 3 2026-06-07 2026-08-26 ok
dev.hookain.de 3 2026-06-15 2026-08-14 ok
www.hookain.de 5 2026-05-04 2026-09-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hookain.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/hookain.de.