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.

14 hosts · 272 ms

HostCertsFirst seenLast seenDNS
kaltiretest.com 4 2026-02-18 2026-07-30 ok
*.kaltiretest.com 1 2026-02-18 2026-02-18 —
eac.kaltiretest.com 1 2026-02-18 2026-02-18 nxdomain
mail.kaltiretest.com 1 2026-02-18 2026-02-18 nxdomain
webmail.kaltiretest.com 1 2026-02-18 2026-02-18 ok
eomail.kaltiretest.com 1 2026-02-18 2026-02-18 ok
shop.kaltiretest.com 32 2026-05-02 2026-09-26 ok
*.shop.kaltiretest.com 22 2026-05-31 2026-09-26 —
eomail-backup.kaltiretest.com 1 2026-02-18 2026-02-18 ok
autodiscover.kaltiretest.com 1 2026-02-18 2026-02-18 ok
exchangeps.kaltiretest.com 1 2026-02-18 2026-02-18 nxdomain
mailhost.kaltiretest.com 1 2026-02-18 2026-02-18 nxdomain
www.kaltiretest.com 32 2026-05-02 2026-09-26 ok
*.www.kaltiretest.com 20 2026-05-30 2026-09-26 —

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