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.

6 hosts · 171 ms

HostCertsFirst seenLast seen
wow-world.co.jp 5 2026-06-05 2026-10-03
*.wow-world.co.jp 1 2026-01-25 2026-01-25
old.wow-world.co.jp 2 2026-04-05 2026-09-05
info.wow-world.co.jp 13 2026-06-07 2026-10-03
dev.wow-world.co.jp 2 2026-04-05 2026-09-05
www.wow-world.co.jp 1 2026-01-25 2026-01-25

Programmatic access: API GET /v1/hosts/wow-world.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/wow-world.co.jp.