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.

26 hosts · 340 ms

HostCertsFirst seenLast seenDNS
hejoscar.dk 13 2026-04-20 2026-10-03 ok
*.hejoscar.dk 13 2026-04-20 2026-10-03 —
tilvalg.hejoscar.dk 10 2026-05-15 2026-09-11 ok
blog.hejoscar.dk 10 2026-05-02 2026-09-29 ok
mon-stg.hejoscar.dk 15 2026-05-09 2026-09-11 ok
feedback.hejoscar.dk 10 2026-04-28 2026-08-30 ok
link.hejoscar.dk 5 2026-04-27 2026-08-23 ok
email.mail.hejoscar.dk 5 2026-05-16 2026-09-13 ok
zaogzwgn.hejoscar.dk 4 2026-04-19 2026-08-17 ok
mon.hejoscar.dk 15 2026-05-15 2026-09-17 ok
go.hejoscar.dk 4 2026-06-06 2026-10-04 ok
email.hello.hejoscar.dk 1 2026-09-30 2026-09-30 ok
shop.hejoscar.dk 1 2026-08-31 2026-08-31 —
pickup.hejoscar.dk 1 2026-08-25 2026-08-25 ok
faq.hejoscar.dk 9 2026-05-19 2026-09-14 ok
partner.hejoscar.dk 11 2026-04-27 2026-08-25 ok
sponsor.hejoscar.dk 4 2026-04-18 2026-08-14 ok
k8s.hejoscar.dk 4 2026-04-14 2026-08-12 nodata
jenkins.hejoscar.dk 5 2026-05-06 2026-09-03 ok
teleport.hejoscar.dk 25 2026-05-01 2026-09-27 ok
new.hejoscar.dk 4 2026-04-17 2026-08-18 ok
poc-new.hejoscar.dk 5 2026-04-16 2026-08-21 ok
staging-new.hejoscar.dk 4 2026-04-15 2026-08-15 ok
demo-new.hejoscar.dk 4 2026-04-15 2026-08-15 ok
zaogzwgnx.hejoscar.dk 5 2026-04-27 2026-08-25 ok
canary.hejoscar.dk 3 2026-06-05 2026-08-06 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hejoscar.dk (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/hejoscar.dk.