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.

19 hosts · 316 ms

HostCertsFirst seenLast seenDNS
dirkkreuter.com 15 2026-05-09 2026-09-28 ok
*.dirkkreuter.com 11 2026-05-09 2026-09-28 —
www6299360.dirkkreuter.com 5 2026-06-02 2026-09-30 ok
pa.dirkkreuter.com 4 2026-04-17 2026-08-21 ok
karriere.dirkkreuter.com 6 2026-05-31 2026-10-02 ok
store.dirkkreuter.com 13 2026-05-23 2026-10-03 ok
training.dirkkreuter.com 3 2026-06-02 2026-08-03 ok
webinaren.dirkkreuter.com 3 2026-07-21 2026-09-23 ok
go.dirkkreuter.com 5 2026-05-17 2026-09-12 ok
so.dirkkreuter.com 5 2026-07-03 2026-09-02 ok
workshop.dirkkreuter.com 4 2026-06-03 2026-10-05 ok
kalender.dirkkreuter.com 5 2026-05-11 2026-09-12 ok
politiker.dirkkreuter.com 3 2026-06-05 2026-08-06 ok
partner.dirkkreuter.com 5 2026-04-24 2026-08-23 ok
members.dirkkreuter.com 12 2026-04-23 2026-08-19 ok
events.dirkkreuter.com 1 2026-04-14 2026-04-14 ok
account.dirkkreuter.com 15 2026-05-22 2026-10-03 ok
memberspot.dirkkreuter.com 8 2026-05-03 2026-09-12 ok
www.dirkkreuter.com 4 2026-06-03 2026-10-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/dirkkreuter.com (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/dirkkreuter.com.