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.

30 hosts · 368 ms

HostCertsFirst seenLast seenDNS
brilliant.org 16 2025-12-17 2026-09-30 ok
*.brilliant.org 16 2025-12-17 2026-09-30 —
brioche-1.brilliant.org 3 2026-05-29 2026-08-26 nxdomain
dev-django-f1.brilliant.org 3 2026-05-27 2026-08-26 ok
prod-us-west-2.brilliant.org 2 2026-04-29 2026-09-29 ok
*.prod-us-west-2.brilliant.org 2 2026-04-29 2026-09-29 —
prod-eu-west-2.brilliant.org 4 2026-04-16 2026-09-16 ok
*.prod-eu-west-2.brilliant.org 4 2026-04-16 2026-09-16 —
llm-playground.brilliant.org 3 2026-04-17 2026-06-18 nxdomain
prod.brilliant.org 2 2026-04-19 2026-09-19 nodata
*.prod.brilliant.org 2 2026-04-19 2026-09-19 —
brioche.brilliant.org 6 2026-05-26 2026-08-26 ok
blackhole.brilliant.org 3 2026-05-28 2026-08-30 ok
blog.brilliant.org 7 2026-06-20 2026-09-28 ok
educator-api.brilliant.org 16 2026-04-12 2026-10-07 ok
capi.brilliant.org 14 2026-05-14 2026-09-09 ok
link.brilliant.org 3 2026-06-10 2026-08-25 ok
retool.brilliant.org 6 2026-04-17 2026-09-11 ok
*.endor.brilliant.org 12 2025-07-10 2026-09-15 —
educator.brilliant.org 5 2026-04-21 2026-08-23 ok
kairos.brilliant.org 3 2026-05-26 2026-08-26 ok
ops.brilliant.org 2 2026-04-19 2026-09-19 nodata
*.ops.brilliant.org 2 2026-04-19 2026-09-19 —
atlantis.ops.brilliant.org 2 2026-03-31 2026-08-31 ok
checkout.brilliant.org 10 2026-04-20 2026-08-16 ok
dev.brilliant.org 3 2026-04-19 2026-09-19 nodata
*.dev.brilliant.org 3 2026-04-19 2026-09-19 —
llm-playground-preview.brilliant.org 3 2026-04-20 2026-06-20 nxdomain
*.preview.brilliant.org 12 2025-07-13 2026-09-15 —
redash-temp-recovery.brilliant.org 4 2026-05-26 2026-05-26 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/brilliant.org (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/brilliant.org.