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.

3 hosts · 212 ms

HostCertsFirst seenLast seen
wittig.com 5 2026-05-06 2026-08-29
link.wittig.com 5 2026-05-08 2026-09-05
www.wittig.com 5 2026-05-06 2026-08-29

Programmatic access: API GET /v1/hosts/wittig.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/wittig.com.