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.

11 hosts · 257 ms

HostCertsFirst seenLast seenDNS
qualialife.com 14 2026-05-05 2026-08-31 ok
*.qualialife.com 14 2026-05-05 2026-08-31 —
measure2.qualialife.com 5 2026-04-21 2026-10-02 ok
shire-stage.qualialife.com 4 2026-06-22 2026-08-22 ok
shire.qualialife.com 5 2026-05-28 2026-09-26 ok
measure.qualialife.com 5 2026-04-13 2026-09-20 ok
i.qualialife.com 3 2026-04-29 2026-08-14 ok
alan-itics.qualialife.com 5 2026-05-04 2026-09-02 ok
mta-sts.qualialife.com 3 2026-04-26 2026-09-16 ok
privacy.qualialife.com 4 2026-04-18 2026-08-20 ok
sdhnz.qualialife.com 9 2026-05-19 2026-09-14 ok

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