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.

4 hosts · 290 ms

HostCertsFirst seenLast seenDNS
enerdata.net 2 2025-08-25 2026-08-28 ok
*.enerdata.net 2 2025-08-25 2026-08-28 —
cdn.enerdata.net 1 2025-12-07 2025-12-07 ok
jobs.enerdata.net 5 2026-06-22 2026-09-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/enerdata.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/enerdata.net.