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.

4 hosts · 261 ms

HostCertsFirst seenLast seen
unmsapp.com 3 2025-07-16 2026-06-16
*.unmsapp.com 38 2025-07-16 2026-10-01
*.stg.unmsapp.com 38 2025-07-16 2026-10-04
*.dev.unmsapp.com 38 2025-07-16 2026-10-06

Programmatic access: API GET /v1/hosts/unmsapp.com (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/unmsapp.com.