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.

4 hosts · 286 ms

HostCertsFirst seenLast seenDNS
speedypublishing.com 15 2026-05-26 2026-10-04 ok
helpdesk.speedypublishing.com 20 2026-05-08 2026-09-03 ok
authors.speedypublishing.com 2 2026-01-29 2026-06-26 ok
www.speedypublishing.com 14 2026-05-24 2026-10-03 ok

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