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 · 330 ms

HostCertsFirst seenLast seenDNS
startup-residence.ca 5 2025-09-11 2026-07-14 ok
prod.startup-residence.ca 6 2025-07-30 2026-07-21 ok
preview-prod.startup-residence.ca 5 2025-08-13 2026-07-21 nxdomain
stg.startup-residence.ca 6 2025-07-30 2026-07-21 ok
preview-stg.startup-residence.ca 5 2025-08-13 2026-07-21 ok
dev.startup-residence.ca 6 2025-07-30 2026-07-21 ok
preview-dev.startup-residence.ca 5 2025-08-13 2026-07-21 ok
preview.startup-residence.ca 5 2025-08-13 2026-07-21 ok
www.startup-residence.ca 4 2025-09-11 2026-07-14 ok

Programmatic access, with DNS A records: API GET /v1/hosts/startup-residence.ca (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/startup-residence.ca.