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.

5 hosts · 232 ms

HostCertsFirst seenLast seen
xpertcenter.ch 6 2026-03-03 2026-09-29
sip.xpertcenter.ch 1 2025-07-29 2025-07-29
transfer.xpertcenter.ch 1 2026-02-09 2026-02-09
autodiscover.xpertcenter.ch 1 2026-03-03 2026-03-03
www.xpertcenter.ch 6 2026-03-30 2026-09-29

Programmatic access: API GET /v1/hosts/xpertcenter.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/xpertcenter.ch.