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.

11 hosts · 307 ms

HostCertsFirst seenLast seenDNS
workus-web.com 3 2025-08-19 2026-09-08 ok
*.workus-web.com 1 2026-04-17 2026-04-17 —
partner-site.workus-web.com 5 2026-05-25 2026-09-22 ok
link.workus-web.com 6 2026-05-21 2026-09-12 ok
url.workus-web.com 2 2026-08-28 2026-08-28 ok
connect.workus-web.com 5 2026-04-22 2026-08-15 ok
support.workus-web.com 5 2026-05-25 2026-09-22 ok
office-support.workus-web.com 5 2026-05-25 2026-09-22 ok
consumer-support.workus-web.com 5 2026-05-25 2026-09-22 ok
partnersupport.workus-web.com 5 2026-05-25 2026-09-22 ok
www.workus-web.com 2 2025-08-19 2026-09-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/workus-web.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/workus-web.com.