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.

13 hosts · 341 ms

HostCertsFirst seenLast seenDNS
hiroad.com 2 2025-10-01 2026-09-01 ok
*.hiroad.com 2 2026-03-18 2026-08-18 —
vanguard.hiroad.com 2 2026-06-08 2026-06-08 nodata
www.vanguard.hiroad.com 2 2026-06-08 2026-06-08 nxdomain
enterprise.hiroad.com 1 2025-10-27 2025-10-27 nxdomain
www.enterprise.hiroad.com 1 2025-10-27 2025-10-27 nxdomain
cloud.email.hiroad.com 2 2025-08-03 2026-07-22 ok
image.email.hiroad.com 2 2025-08-25 2026-09-16 ok
click.email.hiroad.com 2 2025-08-02 2026-07-20 ok
pages.email.hiroad.com 2 2025-08-03 2026-07-21 ok
view.email.hiroad.com 2 2025-08-03 2026-07-22 ok
help.hiroad.com 8 2026-05-04 2026-09-01 ok
zero-faq.hiroad.com 8 2026-05-04 2026-09-01 ok

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