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 · 318 ms

HostCertsFirst seenLast seenDNS
in-extenso.ch 8 2025-12-25 2026-09-03 ok
nomade.in-extenso.ch 1 2026-04-07 2026-04-07 ok
mail.in-extenso.ch 8 2026-05-04 2026-10-03 ok
eye.mail.in-extenso.ch 8 2026-05-04 2026-10-03 ok
img.mail.in-extenso.ch 8 2026-05-04 2026-10-03 ok
landings.mail.in-extenso.ch 8 2026-05-04 2026-10-03 ok
forms.mail.in-extenso.ch 8 2026-05-04 2026-10-03 ok
img.email.in-extenso.ch 2 2026-10-05 2026-10-05 ok
r.email.in-extenso.ch 1 2026-09-28 2026-09-28 ok
enterpriseregistration.in-extenso.ch 1 2026-06-08 2026-06-08 nodata
projet.in-extenso.ch 5 2026-05-06 2026-09-03 ok
www.in-extenso.ch 7 2026-02-27 2026-09-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/in-extenso.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/in-extenso.ch.