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 · 146 ms

HostCertsFirst seenLast seen
platts.spglobal.com 6 2025-08-17 2026-06-18
*.platts.spglobal.com 2 2025-07-25 2026-06-25
platform.platts.spglobal.com 6 2025-07-25 2026-07-24
platform-1-as.platts.spglobal.com 6 2025-08-17 2026-06-18
platform-2-as.platts.spglobal.com 6 2025-08-17 2026-06-18
platform-1-av.platts.spglobal.com 6 2025-08-17 2026-06-18
platform-2-av.platts.spglobal.com 6 2025-08-17 2026-06-18

Programmatic access: API GET /v1/hosts/platts.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/platts.spglobal.com.