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.

18 hosts · 226 ms

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HostCertsFirst seenLast seen
ap4.se 15 2026-04-22 2026-10-16
impa.ap4.se 10 2026-05-13 2026-09-09
triforce.ap4.se 10 2026-05-10 2026-09-06
skalman-stage.ap4.se 13 2026-05-20 2026-09-16
stampe.ap4.se 2 2026-08-26 2026-08-26
inte.ap4.se 10 2026-06-15 2026-10-11
chartpack.ap4.se 6 2026-05-07 2026-09-02
skalman.ap4.se 7 2026-05-31 2026-09-27
plattan.ap4.se 2 2026-10-01 2026-10-01
ganon.ap4.se 6 2026-05-06 2026-09-01
alwaysonvpn.ap4.se 5 2026-05-07 2026-10-16
argo.ap4.se 9 2026-06-16 2026-10-13
prep.ap4.se 12 2026-06-15 2026-10-12
hedgetools.ap4.se 8 2026-05-07 2026-09-02
dfrespons.ap4.se 1 2026-05-19 2026-05-19
argo-events.ap4.se 11 2026-06-10 2026-10-07
www.ap4.se 11 2026-05-30 2026-09-26
matrix.ap4.se 10 2026-05-08 2026-09-04

Programmatic access: API GET /v1/hosts/ap4.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/ap4.se.