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.

4 hosts · 210 ms

HostCertsFirst seenLast seenDNS
cloud.pluscontact.tokyu.co.jp 1 2026-02-06 2026-02-06 ok
image.pluscontact.tokyu.co.jp 23 2026-02-06 2026-10-05 ok
click.pluscontact.tokyu.co.jp 1 2026-02-06 2026-02-06 ok
view.pluscontact.tokyu.co.jp 1 2026-02-06 2026-02-06 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pluscontact.tokyu.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/pluscontact.tokyu.co.jp.