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 · 238 ms

HostCertsFirst seenLast seen
graphitehq.com 6 2025-10-08 2026-09-13
*.graphitehq.com 10 2025-10-08 2026-09-13
*.dev.graphitehq.com 4 2025-10-19 2026-09-19

Programmatic access: API GET /v1/hosts/graphitehq.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/graphitehq.com.