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 · 277 ms

HostCertsFirst seenLast seenDNS
blackspire.partners 12 2026-05-02 2026-09-11 ok
agencyhub.blackspire.partners 6 2026-06-18 2026-09-02 ok
funnel.blackspire.partners 8 2026-04-24 2026-08-20 ok
app.blackspire.partners 11 2026-06-07 2026-10-03 ok
files.blackspire.partners 5 2026-04-28 2026-08-27 ok
www.files.blackspire.partners 5 2026-04-28 2026-08-27 ok
links.blackspire.partners 2 2026-05-06 2026-10-06 ok
tools.blackspire.partners 1 2026-09-14 2026-09-14 ok
caps.blackspire.partners 5 2026-05-12 2026-09-14 ok
inst.blackspire.partners 5 2026-05-25 2026-09-27 ok
www.blackspire.partners 10 2026-04-28 2026-09-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/blackspire.partners (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/blackspire.partners.