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.

5 hosts · 283 ms

HostCertsFirst seenLast seenDNS
mvscanada.ca 1 2026-01-27 2026-01-27 ok
*.mvscanada.ca 1 2026-01-27 2026-01-27 —
portal.mvscanada.ca 1 2025-12-27 2025-12-27 ok
*.portal.mvscanada.ca 1 2025-12-27 2025-12-27 —
server.mvscanada.ca 4 2026-04-21 2026-08-19 ok

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