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.

4 hosts · 182 ms

HostCertsFirst seenLast seen
*.twofive25.jp 1 2026-02-10 2026-02-10
support.twofive25.jp 4 2026-04-20 2026-08-18
products-support.twofive25.jp 4 2026-04-20 2026-08-18
phishnet-support.twofive25.jp 4 2026-04-20 2026-08-18

Programmatic access: API GET /v1/hosts/twofive25.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/twofive25.jp.