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.

5 hosts · 288 ms

HostCertsFirst seenLast seen
smartcat.ai 50 2025-09-08 2026-10-02
*.smartcat.ai 50 2025-09-08 2026-10-02
welcome.smartcat.ai 10 2026-04-23 2026-08-19
sales.smartcat.ai 5 2026-06-01 2026-09-29
status.smartcat.ai 4 2026-06-08 2026-08-13

Programmatic access: API GET /v1/hosts/smartcat.ai (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/smartcat.ai.