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.

23 hosts · 280 ms

HostCertsFirst seenLast seen
arcana.io 8 2026-05-11 2026-08-22
stage.arcana.io 5 2026-05-06 2026-09-02
cc.stage.arcana.io 5 2026-05-23 2026-09-20
cdn.stage.arcana.io 5 2026-04-23 2026-09-30
example.arcana.io 5 2026-04-28 2026-08-26
grpc-backend-internal.prod-internal.arcana.io 5 2026-06-04 2026-10-02
as-monitoring-grafana.stage-internal.arcana.io 6 2026-04-26 2026-09-20
grpc-backend-internal.stage-internal.arcana.io 5 2026-05-16 2026-09-13
as-monitoring-prom.stage-internal.arcana.io 6 2026-04-26 2026-09-20
amt.stage-internal.arcana.io 5 2026-04-26 2026-08-24
hello.arcana.io 6 2026-05-27 2026-08-23
help.arcana.io 6 2026-05-15 2026-09-11
app.arcana.io 7 2026-05-08 2026-09-12
cc2.app.arcana.io 2 2026-07-08 2026-07-08
cc.app.arcana.io 5 2026-05-26 2026-09-07
api.app.arcana.io 10 2026-04-23 2026-09-07
excel.app.arcana.io 4 2026-04-23 2026-10-04
help.app.arcana.io 9 2026-04-27 2026-09-12
test.arcana.io 5 2026-04-28 2026-08-26
apptest.arcana.io 5 2026-05-10 2026-09-07
dev.arcana.io 2 2026-05-05 2026-05-05
cc.dev.arcana.io 5 2026-06-06 2026-10-04
www.arcana.io 8 2026-05-05 2026-08-22

Programmatic access: API GET /v1/hosts/arcana.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/arcana.io.