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.

10 hosts · 426 ms

HostCertsFirst seenLast seenDNS
stackworks.ch 10 2026-04-08 2026-09-22 ok
portal.stackworks.ch 2 2026-06-23 2026-08-19 ok
n8n.stackworks.ch 3 2026-05-24 2026-09-12 ok
en.stackworks.ch 10 2026-05-15 2026-09-10 ok
admin.stackworks.ch 2 2026-06-23 2026-08-16 ok
go.help.stackworks.ch 2 2025-06-19 2026-05-20 ok
chat.int.stackworks.ch 3 2026-05-18 2026-09-02 ok
viu-chat.int.stackworks.ch 3 2026-05-09 2026-08-23 ok
support.stackworks.ch 2 2025-06-19 2026-05-20 ok
www.stackworks.ch 15 2026-05-02 2026-09-30 ok

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