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.

6 hosts · 273 ms

HostCertsFirst seenLast seenDNS
elferspot.com 8 2025-07-31 2026-09-04 ok
st2.elferspot.com 3 2026-06-28 2026-08-28 ok
stg.elferspot.com 9 2026-04-19 2026-10-01 ok
cdn.elferspot.com 9 2026-04-11 2026-09-23 servfail
test-cdn.elferspot.com 10 2026-04-19 2026-10-01 ok
www.elferspot.com 12 2025-07-31 2026-09-26 ok

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