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.

11 hosts · 350 ms

HostCertsFirst seenLast seenDNS
lemniscus.de 2 2025-12-16 2026-02-02 ok
*.lemniscus.de 4 2025-11-01 2026-10-02 —
stage.lemniscus.de 1 2025-11-29 2025-11-29 ok
uptime.lemniscus.de 5 2026-05-06 2026-09-03 ok
ausstelleranmeldung.lemniscus.de 16 2026-04-15 2026-08-11 ok
helpdesk.lemniscus.de 24 2026-04-28 2026-09-10 ok
sign.lemniscus.de 5 2026-05-11 2026-09-09 ok
help.lemniscus.de 6 2026-02-26 2026-09-11 ok
autodiscover.lemniscus.de 2 2026-03-23 2026-08-23 ok
mta-sts.lemniscus.de 5 2026-05-26 2026-09-23 ok
status.lemniscus.de 5 2026-04-29 2026-08-28 ok

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