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.

7 hosts · 141 ms

HostCertsFirst seenLast seen
dev.researchsignals.spglobal.com 2 2026-03-02 2026-07-18
dev-alb.dev.researchsignals.spglobal.com 2 2026-03-02 2026-07-18
vradbsite.dev.researchsignals.spglobal.com 2 2026-03-02 2026-07-18
api.dev.researchsignals.spglobal.com 3 2025-12-09 2026-07-18
*.api.dev.researchsignals.spglobal.com 1 2025-12-09 2025-12-09
signalsmailer.dev.researchsignals.spglobal.com 2 2026-03-02 2026-07-18
rabbit.dev.researchsignals.spglobal.com 2 2026-03-02 2026-07-18

Programmatic access: API GET /v1/hosts/dev.researchsignals.spglobal.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/dev.researchsignals.spglobal.com.