Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 292 ms

HostCertsFirst seenLast seenDNS
leaserad.de 11 2026-05-29 2026-09-28 ok
*.leaserad.de 11 2026-05-29 2026-09-28 —
jira.leaserad.de 1 2026-02-18 2026-02-18 ok
sending.leaserad.de 1 2026-09-14 2026-09-14 ok
wiki.leaserad.de 1 2026-02-18 2026-02-18 ok
erp.leaserad.de 10 2026-05-30 2026-09-28 ok
sending.erp.leaserad.de 1 2026-09-14 2026-09-14 ok
jirat.leaserad.de 1 2026-02-18 2026-02-18 ok
confluencet.leaserad.de 1 2026-02-18 2026-02-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/leaserad.de (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/leaserad.de.