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.

11 hosts · 175 ms

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HostCertsFirst seenLast seen
immobilienscout24.at 2 2026-03-11 2026-07-27
*.immobilienscout24.at 3 2026-02-11 2026-07-27
tracking.immobilienscout24.at 2 2026-02-22 2026-07-25
link.immobilienscout24.at 5 2026-05-07 2026-10-06
login.immobilienscout24.at 4 2026-05-29 2026-10-01
sso.immobilienscout24.at 1 2026-05-21 2026-05-21
login-tmp.immobilienscout24.at 7 2026-05-10 2026-08-11
links.immobilienscout24.at 1 2025-12-25 2025-12-25
mta-sts.immobilienscout24.at 2 2026-03-11 2026-08-11
import.immobilienscout24.at 1 2026-09-29 2026-09-29
oktagv.immobilienscout24.at 4 2026-05-30 2026-10-18

Programmatic access: API GET /v1/hosts/immobilienscout24.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/immobilienscout24.at.