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.

5 hosts · 334 ms

HostCertsFirst seenLast seenDNS
coeo-inkasso.at 4 2025-07-17 2026-09-28 ok
*.coeo-inkasso.at 3 2026-03-23 2026-09-28 —
sslvpn.coeo-inkasso.at 4 2026-04-18 2026-09-17 ok
test.coeo-inkasso.at 5 2026-04-26 2026-08-24 ok
www.coeo-inkasso.at 1 2025-07-17 2025-07-17 ok

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