Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

9 hosts · 290 ms

HostCertsFirst seenLast seen
canary-app.jp 3 2026-05-16 2026-09-03
*.canary-app.jp 3 2026-05-16 2026-09-03
corp.canary-app.jp 4 2026-04-14 2026-09-20
*.corp.canary-app.jp 4 2026-04-14 2026-09-20
newgrads.canary-app.jp 3 2026-05-02 2026-08-15
recruit.canary-app.jp 4 2026-04-21 2026-08-23
support.canary-app.jp 10 2026-05-25 2026-09-21
inquiry.canary-app.jp 12 2026-04-17 2026-08-14
biz.canary-app.jp 5 2026-04-25 2026-10-02

Programmatic access: API GET /v1/hosts/canary-app.jp (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/canary-app.jp.