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.

4 hosts · 208 ms

HostCertsFirst seenLast seenDNS
cloud.marketing.victorinox.com 3 2026-03-03 2026-08-05 ok
image.marketing.victorinox.com 3 2026-02-04 2026-09-25 ok
click.marketing.victorinox.com 2 2026-03-03 2026-08-04 ok
view.marketing.victorinox.com 3 2026-03-03 2026-08-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/marketing.victorinox.com (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/marketing.victorinox.com.