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.

25 hosts · 264 ms

HostCertsFirst seenLast seenDNS
nichinoken.co.jp 3 2025-06-30 2026-09-13 nodata
movie.nichinoken.co.jp 1 2026-02-18 2026-02-18 ok
nise.nichinoken.co.jp 2 2026-06-22 2026-09-04 nodata
www.nise.nichinoken.co.jp 2 2026-06-22 2026-09-04 ok
desk.kansai.nichinoken.co.jp 2 2026-05-07 2026-07-24 ok
desk.nichinoken.co.jp 3 2025-11-30 2026-07-24 ok
www.desk.nichinoken.co.jp 1 2025-11-30 2025-11-30 nxdomain
mail.nichinoken.co.jp 3 2026-05-05 2026-10-04 ok
arc.email.nichinoken.co.jp 3 2026-05-05 2026-10-04 ok
app.nichinoken.co.jp 2 2025-08-31 2026-09-03 ok
dev.app.nichinoken.co.jp 2 2025-08-31 2026-09-03 ok
www.dev.app.nichinoken.co.jp 1 2025-08-31 2025-08-31 nxdomain
www.app.nichinoken.co.jp 1 2025-08-31 2025-08-31 nxdomain
nbr.nichinoken.co.jp 2 2026-06-01 2026-08-16 ok
front1.prd.ntus.nichinoken.co.jp 2 2025-08-31 2026-09-03 ok
www.front1.prd.ntus.nichinoken.co.jp 1 2025-08-31 2025-08-31 nxdomain
front1.dev.ntus.nichinoken.co.jp 2 2025-08-31 2026-09-03 ok
www.front1.dev.ntus.nichinoken.co.jp 1 2025-08-31 2025-08-31 nxdomain
portlet.nichinoken.co.jp 2 2026-07-15 2026-09-27 ok
recruit.nichinoken.co.jp 2 2025-10-29 2026-10-01 nodata
www.recruit.nichinoken.co.jp 2 2025-10-29 2026-10-01 ok
knt.nichinoken.co.jp 2 2026-05-07 2026-07-24 ok
mv.nichinoken.co.jp 1 2025-10-31 2025-10-31 ok
www.mv.nichinoken.co.jp 1 2025-10-31 2025-10-31 nxdomain
www.nichinoken.co.jp 3 2025-06-30 2026-09-13 ok

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