Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

12 hosts · 217 ms

HostCertsFirst seenLast seen
northmill.se 2 2026-03-30 2026-08-30
dataskydd.northmill.se 4 2025-09-30 2026-09-16
scheduling.northmill.se 5 2026-04-27 2026-08-29
klick.northmill.se 15 2026-05-31 2026-09-29
aml.northmill.se 3 2026-05-04 2026-08-19
n.northmill.se 5 2026-05-07 2026-09-04
mta-sts.info.northmill.se 1 2025-11-16 2025-11-16
dsar.northmill.se 4 2025-09-30 2026-09-16
mta-sts.northmill.se 2 2025-10-12 2026-09-12
mta-sts.news.northmill.se 1 2025-11-16 2025-11-16
northnet.northmill.se 3 2026-05-02 2026-08-19
www.northmill.se 2 2026-03-30 2026-08-30

Programmatic access: API GET /v1/hosts/northmill.se (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/northmill.se.