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.

8 hosts · 244 ms

HostCertsFirst seenLast seenDNS
monitaur.ai 24 2026-05-03 2026-09-01 ok
*.monitaur.ai 12 2026-05-03 2026-08-30 —
mail.monitaur.ai 10 2026-05-02 2026-08-29 ok
notification.monitaur.ai 2 2026-08-27 2026-08-27 ok
*.notification.monitaur.ai 2 2026-08-27 2026-08-27 —
info.monitaur.ai 6 2026-05-02 2026-08-28 ok
status.monitaur.ai 3 2026-06-08 2026-08-06 ok
www.monitaur.ai 6 2026-05-18 2026-09-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/monitaur.ai (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/monitaur.ai.