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.

20 hosts · 321 ms

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HostCertsFirst seenLast seen
3qsdn.com 7 2025-12-19 2026-08-14
*.3qsdn.com 7 2025-12-19 2026-08-14
platform-feature-01.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-feature-01.3qsdn.com 3 2026-05-22 2026-08-14
platform-feature-02.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-feature-02.3qsdn.com 3 2026-05-22 2026-08-14
sdn-global-streaming-cache-aka.3qsdn.com 5 2026-05-12 2026-09-29
sdn-global-prog-cache-aka.3qsdn.com 5 2026-05-12 2026-09-29
sdn-global-live-streaming-packager-cache-aka.3qsdn.com 5 2026-05-12 2026-09-29
platform-feature.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-feature.3qsdn.com 3 2026-05-22 2026-08-14
platform-live.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-live.3qsdn.com 3 2026-05-22 2026-08-14
platform-testing.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-testing.3qsdn.com 3 2026-05-22 2026-08-14
platform.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform.3qsdn.com 3 2026-05-22 2026-08-14
events.platform.3qsdn.com 3 2026-05-22 2026-08-14
platform-glass.3qsdn.com 3 2026-05-22 2026-08-14
widgets.platform-glass.3qsdn.com 3 2026-05-22 2026-08-14

Programmatic access: API GET /v1/hosts/3qsdn.com (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/3qsdn.com.