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.

6 hosts · 294 ms

HostCertsFirst seenLast seenDNS
stockevents.app 35 2026-04-10 2026-10-01 ok
join.stockevents.app 35 2026-04-10 2026-10-01 ok
analytics.stockevents.app 4 2026-04-13 2026-08-11 ok
assets.stockevents.app 10 2026-04-25 2026-09-04 ok
checkout.stockevents.app 8 2026-04-22 2026-08-19 ok
www.stockevents.app 35 2026-04-10 2026-10-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/stockevents.app (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/stockevents.app.