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.

9 hosts · 355 ms

HostCertsFirst seenLast seenDNS
sunlight.com 24 2026-04-12 2026-09-25 ok
*.sunlight.com 24 2026-04-12 2026-09-25 —
static.sunlight.com 7 2026-05-29 2026-09-24 ok
care.sunlight.com 41 2026-04-06 2026-10-03 ok
links.mail.sunlight.com 7 2026-05-10 2026-09-05 ok
quiz.sunlight.com 11 2026-05-19 2026-09-14 ok
staging2quiz.sunlight.com 13 2026-05-25 2026-09-20 ok
staging3quiz.sunlight.com 4 2026-06-16 2026-08-14 ok
stagingquiz.sunlight.com 11 2026-06-01 2026-09-27 ok

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