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 · 258 ms

HostCertsFirst seenLast seenDNS
generalmagic.inc 18 2026-05-16 2026-09-13 ok
news.generalmagic.inc 3 2026-06-12 2026-08-12 ok
www.generalmagic.inc 6 2026-05-16 2026-09-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/generalmagic.inc (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/generalmagic.inc.