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.

14 hosts · 287 ms

HostCertsFirst seenLast seenDNS
gjensidige.dk 1 2026-06-09 2026-06-09 ok
beta.gjensidige.dk 2 2026-01-14 2026-06-09 ok
sundhed.gjensidige.dk 3 2026-06-04 2026-08-04 ok
sundhed-virksomhed.gjensidige.dk 3 2026-05-22 2026-08-04 ok
sid.gjensidige.dk 5 2026-04-22 2026-08-20 ok
lederne.gjensidige.dk 3 2026-05-30 2026-08-04 ok
promark.gjensidige.dk 1 2025-10-03 2025-10-03 ok
api-digital.gjensidige.dk 1 2026-06-12 2026-06-12 nxdomain
info.gjensidige.dk 2 2026-03-02 2026-08-10 ok
www.info.gjensidige.dk 2 2026-03-02 2026-08-10 ok
fomo.gjensidige.dk 5 2026-05-05 2026-08-04 ok
sundhed-kontakt.gjensidige.dk 4 2026-05-13 2026-08-04 ok
next.gjensidige.dk 1 2025-08-04 2025-08-04 ok
www.gjensidige.dk 1 2026-06-09 2026-06-09 ok

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