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.

11 hosts · 272 ms

HostCertsFirst seenLast seenDNS
doctorsim.com 20 2025-10-13 2026-09-24 ok
*.doctorsim.com 20 2025-10-13 2026-09-24 —
soporte.doctorsim.com 5 2026-04-21 2026-08-19 ok
blog.doctorsim.com 4 2026-05-31 2026-10-02 ok
blog-en.doctorsim.com 4 2026-05-29 2026-09-30 ok
cdn-video.doctorsim.com 11 2026-05-24 2026-09-20 ok
api.cdp.doctorsim.com 1 2026-01-14 2026-01-14 ok
evs.cdp.doctorsim.com 1 2026-01-14 2026-01-14 ok
app.doctorsim.com 12 2026-05-19 2026-09-14 ok
checkout.doctorsim.com 10 2026-04-21 2026-08-18 ok
notify.doctorsim.com 3 2026-05-04 2026-08-24 ok

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