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.

7 hosts · 216 ms

HostCertsFirst seenLast seenDNS
d-card.jp 9 2025-09-03 2026-09-09 ok
stg.d-card.jp 5 2025-09-02 2026-06-18 ok
ve.m.stg.d-card.jp 2 2025-09-04 2026-07-29 ok
ve.m.d-card.jp 3 2025-09-03 2026-09-09 ok
info.d-card.jp 1 2026-02-05 2026-02-05 ok
docomo.d-card.jp 1 2026-02-05 2026-02-05 ok
ve.x.d-card.jp 1 2026-10-02 2026-10-02 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/d-card.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/d-card.jp.