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.

15 hosts · 369 ms

HostCertsFirst seenLast seenDNS
cubx.com 18 2026-04-18 2026-09-22 ok
*.cubx.com 13 2026-04-18 2026-09-18 —
unifi1.cubx.com 5 2026-04-26 2026-08-24 ok
unifi2.cubx.com 5 2026-04-26 2026-08-24 ok
unifi3.cubx.com 5 2026-04-26 2026-08-24 ok
ttc.cubx.com 2 2026-02-24 2026-06-16 ok
service.cubx.com 9 2026-05-17 2026-09-13 ok
crucible.cubx.com 2 2026-02-24 2026-06-17 ok
cubxunifi.cubx.com 3 2026-06-11 2026-10-03 ok
link.cubx.com 5 2026-04-25 2026-08-23 ok
admin.cubx.com 5 2026-05-26 2026-09-23 ok
anton.cubx.com 4 2026-02-19 2026-10-04 ok
app.cubx.com 5 2026-05-23 2026-09-19 ok
trust.cubx.com 14 2026-04-21 2026-08-18 ok
deploy.cubx.com 2 2026-02-24 2026-06-16 ok

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