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.

5 hosts · 131 ms

HostCertsFirst seenLast seen
communications.canadapost-postescanada.ca 2 2025-08-12 2026-09-08
m.communications.canadapost-postescanada.ca 2 2025-08-12 2026-09-08
res.communications.canadapost-postescanada.ca 2 2025-08-12 2026-09-08
t.communications.canadapost-postescanada.ca 2 2025-08-12 2026-09-08
www.communications.canadapost-postescanada.ca 2 2025-08-12 2026-09-08

Programmatic access: API GET /v1/hosts/communications.canadapost-postescanada.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/communications.canadapost-postescanada.ca.