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 · 314 ms

HostCertsFirst seenLast seenDNS
myfidal.com 6 2025-12-29 2026-10-06 ok
*.myfidal.com 2 2025-12-29 2025-12-29 —
preprod.myfidal.com 7 2026-05-26 2026-09-27 ok
api-ppd.myfidal.com 4 2026-03-16 2026-09-29 ok
api.myfidal.com 4 2026-03-16 2026-09-29 nodata
bo.myfidal.com 9 2026-05-02 2026-09-03 ok
preprodbo.myfidal.com 9 2026-05-26 2026-09-27 ok

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