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.

18 hosts · 382 ms

HostCertsFirst seenLast seenDNS
prospa.com 25 2026-05-14 2026-09-13 ok
*.prospa.com 23 2026-05-14 2026-09-13 —
*.dev.prospa.prospa.com 2 2026-09-10 2026-09-10 —
l.service.prospa.com 7 2025-09-14 2026-08-27 ok
l.marketing.prospa.com 7 2025-09-14 2026-08-27 ok
api.prospa.com 8 2026-05-26 2026-09-21 ok
dev.api.prospa.com 1 2026-07-02 2026-07-02 ok
rp.prospa.com 2 2026-08-04 2026-08-04 nxdomain
phrp.prospa.com 2 2026-08-11 2026-08-11 ok
cms.prospa.com 14 2026-05-31 2026-09-26 ok
forms.prospa.com 8 2026-05-26 2026-09-21 ok
apps.prospa.com 4 2025-10-08 2026-09-10 nodata
*.apps.prospa.com 4 2025-10-08 2026-09-10 —
l.support.prospa.com 7 2025-09-14 2026-08-27 ok
dev.prospa.com 6 2025-09-24 2026-09-10 nodata
*.dev.prospa.com 12 2025-09-24 2026-09-10 —
www.prospa.com 2 2026-07-01 2026-07-01 ok
identity.prospa.com 8 2026-05-26 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/prospa.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/prospa.com.