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.

12 hosts · 278 ms

HostCertsFirst seenLast seenDNS
dremo.com 1 2025-12-02 2025-12-02 ok
*.dremo.com 1 2025-12-02 2025-12-02 —
feedback.dremo.com 2 2025-09-02 2026-08-02 ok
mta-sts.tutum.dremo.com 3 2026-05-10 2026-08-08 ok
mta-sts.join.dremo.com 3 2026-05-10 2026-08-26 ok
leads.dremo.com 15 2026-04-11 2026-10-05 ok
forms.dremo.com 2 2025-09-03 2026-08-03 ok
mta-sts.dremo.com 3 2026-05-10 2026-08-26 ok
mta-sts.news.dremo.com 3 2026-05-10 2026-08-26 ok
et.dremo.com 4 2026-04-09 2026-08-07 ok
mta-sts.mailout.dremo.com 3 2026-05-10 2026-08-26 ok
mta-sts.notify.dremo.com 3 2026-05-10 2026-08-26 ok

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