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.

7 hosts · 320 ms

HostCertsFirst seenLast seenDNS
vistaprint.ca 17 2025-10-29 2026-09-24 ok
*.vistaprint.ca 16 2026-04-14 2026-09-24 —
links.mail.vistaprint.ca 2 2025-06-18 2026-05-18 ok
partners.vistaprint.ca 2 2026-04-06 2026-09-06 ok
url.t.vistaprint.ca 1 2026-05-04 2026-05-04 ok
www.vistaprint.ca 1 2025-10-29 2025-10-29 ok
gallery.vistaprint.ca 16 2026-05-04 2026-08-31 ok

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