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.

5 hosts · 316 ms

HostCertsFirst seenLast seenDNS
tui-reisebuero.de 7 2025-12-08 2026-08-08 ok
link.info.tui-reisebuero.de 1 2026-01-22 2026-01-22 ok
link.news.tui-reisebuero.de 28 2026-04-16 2026-09-26 ok
kreuzfahrt.tui-reisebuero.de 5 2026-06-03 2026-10-01 ok
www.tui-reisebuero.de 1 2025-12-08 2025-12-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tui-reisebuero.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/tui-reisebuero.de.