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.

8 hosts · 334 ms

HostCertsFirst seenLast seenDNS
secninjaz.com 10 2026-05-01 2026-06-01 ok
*.secninjaz.com 6 2026-04-13 2026-10-07 —
tiago2.secninjaz.com 2 2026-04-27 2026-04-27 nxdomain
api.secninjaz.com 7 2026-04-27 2026-09-05 ok
zoho.secninjaz.com 14 2026-05-25 2026-09-30 ok
cms.secninjaz.com 5 2026-06-30 2026-09-05 ok
careers.secninjaz.com 27 2026-06-24 2026-09-27 ok
www.secninjaz.com 10 2026-05-20 2026-06-01 ok

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