Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

7 hosts · 379 ms

HostCertsFirst seenLast seenDNS
sqlbi.com 2 2026-02-14 2026-07-13 ok
d.sqlbi.com 2 2026-02-14 2026-06-25 ok
whiteboard.sqlbi.com 1 2026-08-17 2026-08-17 ok
api.sqlbi.com 3 2026-02-13 2026-06-25 ok
cdn.sqlbi.com 2 2026-02-14 2026-06-25 ok
docs.sqlbi.com 5 2026-04-30 2026-08-28 ok
www.sqlbi.com 3 2026-02-13 2026-06-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sqlbi.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/sqlbi.com.