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 · 232 ms

HostCertsFirst seenLast seenDNS
kaigojob-academy.com 16 2025-12-17 2026-09-05 ok
*.kaigojob-academy.com 7 2025-12-17 2026-07-26 —
wp-stg.kaigojob-academy.com 12 2026-04-30 2026-08-26 ok
app.kaigojob-academy.com 10 2026-04-15 2026-08-11 ok
register.kaigojob-academy.com 10 2026-05-28 2026-09-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/kaigojob-academy.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/kaigojob-academy.com.