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.

6 hosts · 315 ms

HostCertsFirst seenLast seenDNS
veremark.app 4 2025-06-22 2026-05-23 nodata
*.veremark.app 4 2025-06-22 2026-05-23 —
stage.veremark.app 2 2026-01-11 2026-01-12 nodata
*.stage.veremark.app 2 2026-01-11 2026-01-12 —
*.tell.veremark.app 3 2025-10-16 2026-09-16 —
aus.tell.veremark.app 4 2025-10-16 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/veremark.app (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/veremark.app.