Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 278 ms

HostCertsFirst seenLast seen
eplus.co.jp 2 2026-02-20 2026-07-08
*.eplus.co.jp 2 2026-02-20 2026-07-08
fs1.eplus.co.jp 5 2026-05-26 2026-09-24
fs2.eplus.co.jp 5 2026-05-26 2026-09-24

Programmatic access: API GET /v1/hosts/eplus.co.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/eplus.co.jp.