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.

3 hosts · 306 ms

HostCertsFirst seenLast seenDNS
truepodium.com 15 2026-04-10 2026-10-05 ok
account.truepodium.com 1 2026-09-28 2026-09-28 ok
www.truepodium.com 18 2026-04-22 2026-10-04 ok

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