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.

5 hosts · 249 ms

HostCertsFirst seenLast seenDNS
truescrow.com 12 2026-05-14 2026-09-28 ok
*.truescrow.com 7 2026-05-17 2026-09-28 —
app.truescrow.com 7 2026-05-14 2026-09-18 ok
files.truescrow.com 5 2026-05-21 2026-09-17 ok
www.truescrow.com 5 2026-05-14 2026-09-19 ok

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