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.

12 hosts · 273 ms

HostCertsFirst seenLast seen
beisia.co.jp 2 2026-01-15 2026-01-16
*.beisia.co.jp 2 2026-01-15 2026-01-16
cws1.beisia.co.jp 2 2025-10-06 2026-09-05
list43v7dg2zMX6.beisia.co.jp 1 2025-10-01 2025-10-01
*.intra.beisia.co.jp 2 2026-01-20 2026-01-21
cmwkinwb1.intra.beisia.co.jp 2 2025-07-04 2026-07-23
vpn.beisia.co.jp 1 2025-12-15 2025-12-15
saiyo.beisia.co.jp 2 2025-08-01 2026-07-01
map.beisia.co.jp 5 2025-06-10 2026-10-03
app-api.stg.partners.beisia.co.jp 1 2026-09-09 2026-09-09
app-customer-api.stg.partners.beisia.co.jp 1 2026-09-09 2026-09-09
gpx.stg.partners.beisia.co.jp 1 2026-09-09 2026-09-09

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