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.

14 hosts · 322 ms

HostCertsFirst seenLast seenDNS
grydpark.ca 15 2026-05-20 2026-10-04 ok
*.grydpark.ca 8 2026-05-20 2026-09-29 —
portal.prod.grydpark.ca 1 2026-09-04 2026-09-04 ok
app.prod.grydpark.ca 1 2026-09-04 2026-09-04 ok
enforcement.prod.grydpark.ca 1 2026-09-04 2026-09-04 ok
portal.staging.grydpark.ca 2 2026-08-07 2026-09-29 ok
app.staging.grydpark.ca 3 2026-08-07 2026-09-29 ok
parkos.staging.grydpark.ca 2 2026-06-30 2026-08-22 ok
demo.parkos.staging.grydpark.ca 2 2026-06-30 2026-08-24 ok
enforcement.staging.grydpark.ca 3 2026-08-07 2026-09-29 ok
link.grydpark.ca 5 2026-06-02 2026-09-30 ok
parkos.grydpark.ca 2 2026-07-10 2026-08-31 ok
demo.parkos.grydpark.ca 2 2026-07-10 2026-09-02 ok
www.grydpark.ca 5 2026-08-06 2026-10-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/grydpark.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/grydpark.ca.