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.

15 hosts · 220 ms

HostCertsFirst seenLast seen
trelleborg.se 64 2025-12-08 2026-10-07
*.trelleborg.se 64 2025-12-08 2026-10-07
w3d3test2.trelleborg.se 1 2025-12-08 2025-12-08
kriswebb.trelleborg.se 3 2026-06-01 2026-08-10
bygglovshjalpen-tryggve.trelleborg.se 4 2026-04-11 2026-08-09
bibliotek.trelleborg.se 4 2026-05-19 2026-07-28
www.bibliotek.trelleborg.se 4 2026-05-19 2026-07-28
open4school.trelleborg.se 1 2025-11-12 2025-11-12
www.open4school.trelleborg.se 1 2025-11-12 2025-11-12
bygglovsguiden.trelleborg.se 3 2026-06-18 2026-08-17
staff.bygglovsguiden.trelleborg.se 3 2026-06-18 2026-08-17
mta-sts.trelleborg.se 4 2026-04-21 2026-08-23
port.trelleborg.se 1 2026-02-23 2026-02-23
*.port.trelleborg.se 1 2026-02-23 2026-02-23
mta-sts.port.trelleborg.se 5 2026-04-23 2026-08-25

Programmatic access: API GET /v1/hosts/trelleborg.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/trelleborg.se.