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.

12 hosts · 281 ms

HostCertsFirst seenLast seen
redballoon.co.nz 17 2025-08-24 2026-09-18
*.redballoon.co.nz 12 2025-08-24 2026-09-22
reviews-feed.redballoon.co.nz 1 2026-06-30 2026-06-30
*.staging.redballoon.co.nz 4 2025-08-24 2026-08-15
*.demo.redballoon.co.nz 4 2025-08-24 2026-08-15
analytics.redballoon.co.nz 2 2025-10-09 2026-09-09
reviews.redballoon.co.nz 2 2026-06-29 2026-06-30
uat.redballoon.co.nz 9 2026-05-10 2026-09-23
*.uat.redballoon.co.nz 5 2025-08-24 2026-08-15
dev.redballoon.co.nz 9 2026-05-19 2026-09-23
*.dev.redballoon.co.nz 5 2025-08-24 2026-08-15
www.redballoon.co.nz 14 2025-08-24 2026-09-18

Programmatic access: API GET /v1/hosts/redballoon.co.nz (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/redballoon.co.nz.