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.

9 hosts · 249 ms

HostCertsFirst seenLast seenDNS
sihd-bk.jp 1 2026-02-24 2026-02-24 nodata
adebis-202207.sihd-bk.jp 2 2026-05-05 2026-10-05 ok
loanweb.sihd-bk.jp 3 2025-09-19 2026-10-05 ok
mypage.sihd-bk.jp 1 2026-02-13 2026-02-13 ok
loanbo.sihd-bk.jp 2 2025-09-19 2026-10-05 nxdomain
app.sihd-bk.jp 2 2026-03-31 2026-09-28 ok
faq.sihd-bk.jp 3 2025-07-31 2026-08-12 ok
loanwebtest.sihd-bk.jp 3 2026-07-02 2026-09-28 ok
www.sihd-bk.jp 1 2026-02-24 2026-02-24 ok

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