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.

15 hosts · 312 ms

HostCertsFirst seenLast seenDNS
rhi.com 2 2026-01-25 2026-01-28 ok
*.rhi.com 2 2026-01-25 2026-01-28 —
z1pwexchna01.na.msds.rhi.com 3 2026-06-04 2026-07-16 nxdomain
z1pwsolarsrv01.na.msds.rhi.com 3 2025-10-30 2026-07-16 nxdomain
www.z1pwsolarsrv01.na.msds.rhi.com 1 2025-10-30 2025-10-30 nxdomain
z1pwexchna02.na.msds.rhi.com 3 2026-06-04 2026-07-16 nxdomain
n1-1exc-hyb03.na.msds.rhi.com 3 2026-06-04 2026-07-16 nxdomain
n1-1exc-hyb05.na.msds.rhi.com 3 2026-06-04 2026-07-16 nxdomain
c3-1exc-hyb01.eu.msds.rhi.com 2 2025-11-12 2026-07-17 nxdomain
c6-1exc-hyb01.eu.msds.rhi.com 2 2025-11-12 2026-07-17 nxdomain
c6-1exc-hyb02.eu.msds.rhi.com 2 2025-11-12 2026-07-17 nxdomain
c6-1nse-ise02.eu.msds.rhi.com 2 2026-06-12 2026-07-16 nxdomain
c3-1exc-hyb03.eu.msds.rhi.com 2 2025-11-12 2026-07-17 nxdomain
c6-1exc-hyb03.eu.msds.rhi.com 2 2025-11-12 2026-07-17 nxdomain
joblist.rhi.com 2 2025-10-06 2026-09-06 ok

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