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 · 383 ms

HostCertsFirst seenLast seenDNS
marko.ch 29 2026-04-18 2026-09-25 ok
*.marko.ch 13 2026-04-20 2026-09-25 —
maintenance.marko.ch 6 2026-05-16 2026-09-11 nxdomain
engineering.marko.ch 2 2026-08-21 2026-08-21 ok
*.engineering.marko.ch 2 2026-08-21 2026-08-21 —
blog.marko.ch 2 2026-07-23 2026-07-23 ok
flash.marko.ch 8 2026-04-18 2026-08-14 ok
cdn.marko.ch 6 2026-06-20 2026-09-28 ok
go.marko.ch 4 2026-04-16 2026-09-01 ok
help.marko.ch 10 2026-06-06 2026-10-03 ok
app.marko.ch 12 2026-05-03 2026-08-29 ok
apps.marko.ch 2 2026-07-23 2026-07-23 ok

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