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.

14 hosts · 246 ms

HostCertsFirst seenLast seenDNS
crowdenergy.io 2 2025-09-19 2026-08-20 ok
dev01.crowdenergy.io 1 2025-11-09 2025-11-09 ok
mqtt-v1.crowdenergy.io 4 2026-04-29 2026-09-29 ok
mqtt-v2.crowdenergy.io 2 2025-09-06 2026-08-07 ok
s3.crowdenergy.io 2 2025-07-19 2026-06-19 ok
api.crowdenergy.io 3 2026-08-11 2026-08-18 ok
webhook.crowdenergy.io 3 2026-04-29 2026-09-29 ok
app.crowdenergy.io 2 2025-11-05 2026-10-06 ok
dev01-user.crowdenergy.io 1 2025-11-09 2025-11-09 nxdomain
app-user.crowdenergy.io 2 2025-11-05 2026-10-06 nxdomain
dev01-mqtt.crowdenergy.io 1 2025-11-09 2025-11-09 ok
app-mqtt.crowdenergy.io 2 2025-11-06 2026-10-07 ok
app-dev.crowdenergy.io 1 2025-11-09 2025-11-09 nxdomain
www.crowdenergy.io 2 2025-09-19 2026-08-20 ok

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