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 · 339 ms

HostCertsFirst seenLast seenDNS
zohosign.com 10 2026-04-25 2026-08-24 ok
learn-admin.zohosign.com 2 2026-08-14 2026-08-14 ok
learn.zohosign.com 2 2026-08-14 2026-08-14 ok
notifications.zohosign.com 8 2026-06-01 2026-07-31 ok

Programmatic access, with DNS A records: API GET /v1/hosts/zohosign.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/zohosign.com.