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 · 316 ms

HostCertsFirst seenLast seenDNS
report-uri.com 39 2026-05-01 2026-10-03 ok
*.report-uri.com 39 2026-05-01 2026-10-03 —
blog.report-uri.com 8 2026-06-02 2026-09-29 ok
*.blog.report-uri.com 8 2026-06-02 2026-09-29 —
ams.report-uri.com 10 2026-04-27 2026-09-11 ok
*.ams.report-uri.com 10 2026-04-27 2026-09-11 —
checkout.report-uri.com 6 2026-04-21 2026-08-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/report-uri.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/report-uri.com.