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 · 224 ms

HostCertsFirst seenLast seen
xfolio.jp 1 2025-12-08 2025-12-08
*.xfolio.jp 1 2025-12-08 2025-12-08
xissmie.xfolio.jp 1 2026-01-16 2026-01-16

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