Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

20 hosts · 266 ms

HostCertsFirst seenLast seen
black.host 27 2026-05-26 2026-09-22
*.black.host 27 2026-05-26 2026-09-22
ns1.black.host 5 2026-05-06 2026-09-04
ns2.black.host 4 2026-06-06 2026-10-05
moya.black.host 4 2026-06-09 2026-10-07
status.moya.black.host 4 2026-06-10 2026-10-10
void.black.host 5 2026-06-09 2026-10-08
status.void.black.host 4 2026-06-06 2026-10-06
blog.staging.black.host 4 2026-06-06 2026-10-06
mail.black.host 5 2026-04-26 2026-08-26
tron.black.host 4 2026-06-10 2026-10-10
status.tron.black.host 4 2026-06-09 2026-10-09
talyn.black.host 4 2026-06-05 2026-10-05
status.talyn.black.host 5 2026-06-05 2026-10-05
docs.black.host 5 2026-05-10 2026-09-08
tardis.black.host 4 2026-06-09 2026-10-07
status.tardis.black.host 5 2026-05-26 2026-09-25
reports.black.host 5 2026-05-29 2026-09-24
phalanx.black.host 2 2026-06-09 2026-06-09
status.phalanx.black.host 4 2026-06-10 2026-10-10

Programmatic access: API GET /v1/hosts/black.host (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/black.host.