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.

24 hosts · 294 ms

HostCertsFirst seenLast seenDNS
brego.io 1 2025-12-08 2025-12-08 ok
*.brego.io 1 2025-12-08 2025-12-08 —
*.dashboard.brego.io 1 2025-11-29 2025-11-29 —
dev.dashboard.brego.io 3 2025-12-21 2026-08-01 ok
*.api.brego.io 1 2025-11-29 2025-11-29 —
oauth.api.brego.io 2 2026-08-17 2026-08-17 ok
dev.api.brego.io 3 2025-12-21 2026-08-01 nxdomain
oauth.sandbox.api.brego.io 2 2026-08-17 2026-08-17 ok
*.check.brego.io 1 2025-11-29 2025-11-29 —
*.platform.brego.io 1 2025-11-29 2025-11-29 —
dev.platform.brego.io 3 2025-12-21 2026-08-01 ok
*.admin.brego.io 1 2025-11-29 2025-11-29 —
dev.admin.brego.io 3 2025-12-21 2026-08-01 ok
*.broker.brego.io 1 2025-12-08 2025-12-08 —
*.dev.broker.brego.io 3 2025-12-21 2026-08-01 —
*.sandbox.broker.brego.io 1 2025-11-29 2025-11-29 —
*.docs.brego.io 1 2025-12-08 2025-12-08 —
*.api.docs.brego.io 1 2025-11-29 2025-11-29 —
dev.api.docs.brego.io 3 2025-12-21 2026-08-01 nxdomain
cms.brego.io 10 2026-05-02 2026-08-28 ok
assets.brego.io 2 2025-10-12 2026-09-12 ok
sandbox.assets.brego.io 2 2025-10-12 2026-09-12 ok
status.brego.io 6 2026-05-20 2026-09-17 ok
checkout.brego.io 2 2026-08-29 2026-08-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/brego.io (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/brego.io.