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.

3 hosts · 389 ms

HostCertsFirst seenLast seen
*.dr.aeon-allianz.co.jp 1 2025-10-06 2025-10-06
st.aeon-allianz.co.jp 1 2025-07-09 2025-07-09
*.st.aeon-allianz.co.jp 1 2025-07-09 2025-07-09

Programmatic access: API GET /v1/hosts/aeon-allianz.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/aeon-allianz.co.jp.