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.

8 hosts · 282 ms

HostCertsFirst seenLast seenDNS
fr24.com 16 2025-11-15 2026-09-18 ok
*.fr24.com 15 2026-05-22 2026-09-18 —
ipa.fr24.com 2 2025-07-23 2026-06-23 servfail
*.ipa.fr24.com 4 2025-06-25 2026-06-23 —
internal.fr24.com 1 2026-01-04 2026-01-04 ok
*.internal.fr24.com 1 2026-01-04 2026-01-04 —
gto.fr24.com 1 2026-08-18 2026-08-18 ok
support.fr24.com 8 2026-05-17 2026-09-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fr24.com (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/fr24.com.