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.

10 hosts · 234 ms

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HostCertsFirst seenLast seen
optibet.ee 11 2026-05-11 2026-09-07
*.optibet.ee 11 2026-05-11 2026-09-07
sports-app.optibet.ee 12 2026-06-11 2026-10-07
poker.optibet.ee 10 2026-05-12 2026-09-07
*.poker.optibet.ee 10 2026-05-12 2026-09-07
apis.optibet.ee 3 2026-05-06 2026-08-25
mta-sts.optibet.ee 1 2026-02-04 2026-02-04
content.optibet.ee 10 2026-06-11 2026-10-07
int.optibet.ee 22 2026-06-01 2026-09-27
*.int.optibet.ee 22 2026-06-01 2026-09-27

Programmatic access: API GET /v1/hosts/optibet.ee (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/optibet.ee.