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.

6 hosts · 239 ms

HostCertsFirst seenLast seenDNS
wespa.de 2 2025-12-22 2026-09-01 ok
psd2-xs2a.wespa.de 2 2025-08-26 2026-08-03 nxdomain
module.wespa.de 2 2026-01-09 2026-09-01 ok
mailing.wespa.de 5 2026-05-07 2026-09-04 ok
blog.wespa.de 2 2026-04-08 2026-09-23 ok
www.wespa.de 2 2026-01-09 2026-09-01 ok

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