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.

10 hosts · 280 ms

HostCertsFirst seenLast seenDNS
horsedeal.com 13 2026-05-15 2026-09-13 ok
*.horsedeal.com 13 2026-05-15 2026-09-13 —
postcard.horsedeal.com 5 2026-05-13 2026-09-14 ok
map-de.horsedeal.com 5 2026-05-13 2026-09-14 ok
map-ch.horsedeal.com 5 2026-05-13 2026-09-14 ok
link.horsedeal.com 3 2026-05-31 2026-08-08 ok
email.horsedeal.com 5 2026-05-18 2026-09-15 ok
forms.horsedeal.com 8 2026-05-08 2026-09-17 ok
status.horsedeal.com 5 2026-05-16 2026-09-13 ok
support.horsedeal.com 5 2026-04-28 2026-08-26 ok

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