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.

10 hosts · 247 ms

HostCertsFirst seenLast seenDNS
peninsulacanada.ca 56 2026-04-07 2026-08-28 ok
*.peninsulacanada.ca 24 2026-04-21 2026-08-28 —
blog.peninsulacanada.ca 17 2026-06-04 2026-10-01 ok
api.peninsulacanada.ca 4 2026-04-07 2026-06-05 nxdomain
*.api.peninsulacanada.ca 4 2026-04-07 2026-06-05 —
email.peninsulacanada.ca 11 2026-06-03 2026-09-29 ok
pages.peninsulacanada.ca 9 2026-06-03 2026-09-30 ok
payments.peninsulacanada.ca 10 2026-04-22 2026-08-18 ok
podcast.peninsulacanada.ca 11 2026-05-30 2026-09-25 ok
www.peninsulacanada.ca 9 2026-06-03 2026-09-29 ok

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