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.

15 hosts · 183 ms

HostCertsFirst seenLast seen
storium.jp 5 2026-05-13 2026-09-05
click.storium.jp 2 2026-10-13 2026-10-13
portal.storium.jp 12 2026-05-17 2026-09-12
*.portal.storium.jp 12 2026-05-17 2026-09-12
stg.portal.storium.jp 18 2026-05-17 2026-09-13
*.stg.portal.storium.jp 18 2026-05-17 2026-09-13
open.storium.jp 4 2026-06-12 2026-10-10
www.open.storium.jp 4 2026-06-12 2026-10-10
storagedownloader.storium.jp 3 2026-08-12 2026-10-04
assets.storium.jp 4 2026-06-10 2026-09-25
about.storium.jp 5 2026-06-08 2026-10-06
stg.about.storium.jp 4 2026-06-15 2026-10-13
www.about.storium.jp 5 2026-06-08 2026-10-06
dev.storium.jp 4 2026-05-25 2026-09-20
storagedownloader.dev.storium.jp 3 2026-08-12 2026-10-05

Programmatic access: API GET /v1/hosts/storium.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/storium.jp.