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.

8 hosts · 160 ms

HostCertsFirst seenLast seen
heteml.jp 3 2025-07-08 2026-07-17
*.heteml.jp 2 2025-07-08 2026-07-17
hub-engage.heteml.jp 14 2026-05-24 2026-09-19
blog.heteml.jp 2 2026-05-20 2026-05-20
www.blog.heteml.jp 2 2026-05-20 2026-05-20
backup.heteml.jp 2 2025-06-24 2026-07-01
support.heteml.jp 8 2026-05-08 2026-08-20
www.heteml.jp 1 2025-10-15 2025-10-15

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