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 · 218 ms

HostCertsFirst seenLast seen
gmo-k.jp 3 2025-10-22 2026-09-22
*.gmo-k.jp 2 2025-10-19 2026-09-19
domega.gmo-k.jp 14 2026-04-23 2026-08-21
tunnel.gmo-k.jp 3 2026-06-11 2026-08-11
*.tunnel.gmo-k.jp 3 2026-06-11 2026-08-11
lp.gmo-k.jp 3 2026-05-01 2026-08-16

Programmatic access: API GET /v1/hosts/gmo-k.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/gmo-k.jp.