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.

7 hosts · 156 ms

HostCertsFirst seenLast seen
knowde.eu 10 2025-11-11 2026-09-21
*.knowde.eu 10 2025-11-11 2026-09-21
cxp.knowde.eu 6 2025-12-01 2026-05-27
*.cxp.knowde.eu 6 2025-12-01 2026-05-27
*.omya.cxp.knowde.eu 4 2026-04-17 2026-05-27
*.nordmann.cxp.knowde.eu 2 2026-05-27 2026-05-27
*.test.cxp.knowde.eu 4 2026-04-17 2026-05-27

Programmatic access: API GET /v1/hosts/knowde.eu (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/knowde.eu.