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.

14 hosts · 216 ms

HostCertsFirst seenLast seen
playground.ca 3 2025-09-19 2025-12-14
*.playground.ca 2 2026-05-06 2026-10-06
services2.playground.ca 1 2025-09-23 2025-09-23
cms-staging.playground.ca 5 2026-04-16 2026-08-14
promo.playground.ca 8 2026-05-14 2026-09-09
shop.playground.ca 3 2026-04-12 2026-08-29
www.shop.playground.ca 3 2026-04-12 2026-08-29
services.playground.ca 1 2025-11-07 2025-11-07
cms.playground.ca 8 2026-04-16 2026-07-09
assets.playground.ca 2 2025-08-25 2026-08-10
cms-test.playground.ca 3 2026-08-06 2026-10-05
www.playground.ca 2 2025-12-14 2025-12-14
sendy.playground.ca 4 2026-05-31 2026-07-31
community.playground.ca 7 2026-04-26 2026-09-23

Programmatic access: API GET /v1/hosts/playground.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/playground.ca.