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.

12 hosts · 250 ms

HostCertsFirst seenLast seenDNS
brightflow.net 31 2025-12-29 2026-10-02 ok
*.brightflow.net 14 2025-12-29 2026-10-02 —
quote.brightflow.net 6 2026-04-18 2026-08-31 ok
bh.brightflow.net 5 2026-05-23 2026-09-20 ok
link.brightflow.net 5 2026-05-10 2026-09-07 ok
portal.brightflow.net 2 2025-09-28 2026-08-29 ok
cipp.brightflow.net 4 2026-02-10 2026-07-30 ok
hq.brightflow.net 5 2026-05-09 2026-09-06 ok
bftgvlfiber.brightflow.net 5 2026-05-09 2026-09-06 ok
docs.brightflow.net 1 2026-07-14 2026-07-14 ok
careers.brightflow.net 5 2026-05-23 2026-09-20 ok
www.brightflow.net 14 2026-04-28 2026-08-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/brightflow.net (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/brightflow.net.