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.

16 hosts · 392 ms

HostCertsFirst seenLast seenDNS
thefork.ch 5 2025-07-09 2026-07-29 ok
*.thefork.ch 5 2025-07-09 2026-07-29 —
uat1.thefork.ch 2 2026-04-13 2026-06-17 ok
*.uat1.thefork.ch 2 2026-04-13 2026-06-17 —
uat2.thefork.ch 2 2026-04-13 2026-06-16 ok
*.uat2.thefork.ch 2 2026-04-13 2026-06-16 —
uat3.thefork.ch 3 2026-04-13 2026-06-17 ok
*.uat3.thefork.ch 3 2026-04-13 2026-06-17 —
uat4.thefork.ch 2 2026-04-13 2026-06-17 ok
*.uat4.thefork.ch 3 2026-04-13 2026-09-30 —
preprod.thefork.ch 3 2026-01-07 2026-06-29 ok
*.preprod.thefork.ch 3 2026-01-07 2026-06-29 —
mobile.thefork.ch 2 2026-04-13 2026-09-13 ok
apropos.thefork.ch 1 2025-11-11 2025-11-11 ok
support.thefork.ch 2 2026-05-04 2026-05-05 ok
about.thefork.ch 1 2025-11-11 2025-11-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/thefork.ch (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/thefork.ch.