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 · 199 ms

HostCertsFirst seenLast seen
tetoru.net 2 2025-08-14 2026-07-15
*.tetoru.net 2 2025-08-14 2026-07-15
mta-sts.tetoru.net 3 2026-06-10 2026-08-20

Programmatic access: API GET /v1/hosts/tetoru.net (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/tetoru.net.