Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 262 ms

HostCertsFirst seenLast seen
advanis.ca 2 2025-06-27 2026-07-06
*.advanis.ca 2 2025-06-27 2026-07-06
prod.advanis.ca 1 2026-01-05 2026-01-05
*.prod.advanis.ca 1 2026-01-05 2026-01-05

Programmatic access: API GET /v1/hosts/advanis.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/advanis.ca.