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.

20 hosts · 304 ms

HostCertsFirst seenLast seenDNS
pkipartners.nl 2 2026-01-26 2026-01-29 ok
web1.pkipartners.nl 3 2026-06-11 2026-08-23 ok
qwac.pkipartners.nl 5 2026-05-20 2026-08-01 ok
acme.pkipartners.nl 4 2026-04-13 2026-09-06 ok
staging.pkipartners.nl 5 2026-05-04 2026-09-27 ok
link.pkipartners.nl 5 2026-06-02 2026-09-30 ok
g4trial.pkipartners.nl 3 2026-02-07 2026-09-24 ok
crl.pkipartners.nl 4 2026-05-21 2026-08-02 ok
kpn.pkipartners.nl 2 2025-06-17 2026-07-06 ok
informatiepaginas.pkipartners.nl 4 2026-05-20 2026-08-01 ok
mta-sts.pkipartners.nl 4 2026-04-29 2026-07-21 ok
crt.pkipartners.nl 4 2026-05-21 2026-08-02 ok
sst.pkipartners.nl 5 2026-05-22 2026-09-19 ok
dv.pkipartners.nl 5 2025-11-03 2026-08-01 ok
www.dv.pkipartners.nl 1 2025-11-03 2025-11-03 nxdomain
ev.pkipartners.nl 5 2026-01-29 2026-08-01 ok
ov.pkipartners.nl 5 2026-01-27 2026-08-01 ok
www.ov.pkipartners.nl 1 2026-01-27 2026-01-27 nxdomain
www.pkipartners.nl 2 2026-01-26 2026-01-29 ok
blinqx.pkipartners.nl 3 2026-05-22 2026-08-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pkipartners.nl (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/pkipartners.nl.