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.

7 hosts · 274 ms

HostCertsFirst seenLast seenDNS
teacollection.com 16 2026-04-22 2026-08-29 ok
*.teacollection.com 13 2026-04-22 2026-08-29 —
share.teacollection.com 1 2025-11-09 2025-11-09 ok
*.share.teacollection.com 1 2025-11-09 2025-11-09 —
link.teacollection.com 4 2026-05-08 2026-07-07 ok
trk.teacollection.com 15 2026-04-07 2026-10-02 ok
www.teacollection.com 3 2026-06-09 2026-08-08 ok

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