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.

12 hosts · 255 ms

HostCertsFirst seenLast seenDNS
zis.ch 23 2025-09-09 2026-09-07 ok
*.zis.ch 2 2025-09-09 2026-09-07 —
sub.zis.ch 3 2026-08-11 2026-08-11 ok
de.zis.ch 10 2026-05-15 2026-09-10 ok
psug.zis.ch 2 2025-09-03 2026-09-10 ok
powerschool.zis.ch 2 2025-09-02 2026-08-31 ok
voices.zis.ch 2 2026-03-10 2026-07-26 ok
libguides.zis.ch 4 2026-04-15 2026-08-12 ok
nhs.zis.ch 1 2026-09-08 2026-09-08 ok
www.zis.ch 16 2026-05-08 2026-09-04 ok
globalcommunity.zis.ch 1 2026-02-08 2026-02-08 ok
www.globalcommunity.zis.ch 1 2026-02-08 2026-02-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/zis.ch (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/zis.ch.