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 · 310 ms

HostCertsFirst seenLast seen
twelvedata.com 14 2026-05-12 2026-09-07
*.twelvedata.com 15 2026-05-12 2026-09-07
near-ai.twelvedata.com 5 2026-05-13 2026-09-10
api.twelvedata.com 24 2026-06-07 2026-09-10
s3-fundamental.twelvedata.com 6 2026-06-16 2026-08-14
chatgpt.twelvedata.com 5 2026-05-05 2026-09-02
security.twelvedata.com 10 2026-05-01 2026-08-27

Programmatic access: API GET /v1/hosts/twelvedata.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/twelvedata.com.