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.

25 hosts · 311 ms

HostCertsFirst seenLast seenDNS
postnl.be 5 2026-06-08 2026-09-24 ok
prod.postnl.be 5 2026-06-08 2026-09-24 ok
e.emballage.postnl.be 3 2026-06-13 2026-08-28 ok
login-stage.postnl.be 5 2026-06-02 2026-08-13 ok
raf.postnl.be 4 2026-06-01 2026-10-05 ok
acc.raf.postnl.be 5 2026-06-02 2026-08-13 ok
email.postnl.be 5 2026-06-01 2026-09-29 ok
verpakkingen.postnl.be 6 2026-05-13 2026-09-30 ok
login.postnl.be 5 2026-06-08 2026-09-24 ok
email.prco.postnl.be 6 2026-04-15 2026-08-13 ok
link.instapp.postnl.be 5 2026-05-30 2026-09-27 ok
jobs.postnl.be 7 2025-11-28 2026-09-30 ok
www.jobs.postnl.be 5 2025-11-28 2026-08-25 ok
emballages.postnl.be 6 2026-05-13 2026-09-30 ok
mta-sts.postnl.be 4 2026-06-02 2026-09-18 ok
fat.postnl.be 6 2026-04-30 2026-09-24 ok
cpt.fat.postnl.be 6 2026-04-30 2026-09-24 ok
jouw.fat.postnl.be 6 2026-04-30 2026-09-24 ok
pat.postnl.be 7 2026-04-28 2026-09-24 ok
cpt.pat.postnl.be 5 2026-06-02 2026-08-13 ok
jouw.pat.postnl.be 5 2026-06-02 2026-08-13 ok
cpt.postnl.be 5 2026-06-08 2026-09-24 ok
login-dev.postnl.be 6 2026-04-30 2026-09-24 ok
jouw.postnl.be 5 2026-06-08 2026-09-24 ok
www.postnl.be 5 2026-06-08 2026-09-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/postnl.be (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/postnl.be.