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 · 227 ms

HostCertsFirst seenLast seenDNS
skmb.de 2 2026-04-22 2026-07-01 ok
psd2-xs2a.skmb.de 4 2025-08-11 2026-07-22 nxdomain
module.skmb.de 2 2026-04-22 2026-07-01 ok
mailing.skmb.de 5 2026-05-02 2026-08-29 ok
datentransfer.skmb.de 9 2026-04-16 2026-09-08 ok
www.skmb.de 2 2026-04-22 2026-07-01 ok

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