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.

13 hosts · 156 ms

HostCertsFirst seenLast seen
postescanada-canadapost.ca 9 2025-09-30 2026-10-05
*.postescanada-canadapost.ca 1 2026-02-21 2026-02-21
stg20.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
www.stg20.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
dev20.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
stg21.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
dev21.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
ws1.postescanada-canadapost.ca 2 2025-11-20 2026-10-08
www.ws1.postescanada-canadapost.ca 2 2025-11-20 2026-10-08
stg22.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
stg23.postescanada-canadapost.ca 4 2025-09-29 2026-09-16
ws.postescanada-canadapost.ca 3 2025-09-30 2026-09-10
www.postescanada-canadapost.ca 7 2025-09-30 2026-10-05

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