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 · 277 ms

HostCertsFirst seenLast seenDNS
epsilon.jp 1 2026-03-11 2026-03-11 ok
*.epsilon.jp 1 2026-03-11 2026-03-11 —
faq2.epsilon.jp 4 2026-09-28 2026-09-30 nxdomain
*.beta.epsilon.jp 1 2026-03-11 2026-03-11 —
*.secure.epsilon.jp 1 2026-03-11 2026-03-11 —
form.epsilon.jp 4 2026-04-18 2026-08-16 ok
cardplatform.epsilon.jp 3 2026-04-15 2026-09-15 ok
sandbox-cardplatform.epsilon.jp 1 2026-02-04 2026-02-04 ok
*.sandbox-cardplatform.epsilon.jp 1 2026-02-04 2026-02-04 —
*.cardplatform.epsilon.jp 3 2026-04-15 2026-09-15 —

Programmatic access, with DNS A records: API GET /v1/hosts/epsilon.jp (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/epsilon.jp.