Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 309 ms

HostCertsFirst seenLast seenDNS
gmo-fg.com 3 2025-06-17 2026-03-10 ok
*.gmo-fg.com 1 2026-03-10 2026-03-10 —
jrem.gmo-fg.com 5 2026-05-10 2026-09-07 ok
mfsm.gmo-fg.com 5 2026-05-10 2026-09-07 ok
terminal-req.gmo-fg.com 5 2026-05-10 2026-09-07 ok
testorder.gmo-fg.com 5 2025-08-19 2026-07-20 ok
*.testorder.gmo-fg.com 5 2025-08-19 2026-07-20 —
gpt.gmo-fg.com 2 2026-02-22 2026-06-14 ok
inquiry.gmo-fg.com 5 2026-05-10 2026-09-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gmo-fg.com (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-fg.com.