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.

4 hosts · 303 ms

HostCertsFirst seenLast seenDNS
cloud.e.sunwing.ca 1 2025-11-04 2025-11-04 ok
image.e.sunwing.ca 4 2026-01-21 2026-09-08 ok
click.e.sunwing.ca 1 2025-11-04 2025-11-04 ok
view.e.sunwing.ca 1 2025-11-06 2025-11-06 ok

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