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.

17 hosts · 425 ms

HostCertsFirst seenLast seenDNS
wellfound.com 24 2026-05-10 2026-09-28 ok
*.wellfound.com 29 2026-05-10 2026-09-29 —
argocd.wellfound.com 11 2026-04-13 2026-06-01 ok
cloud.wellfound.com 1 2025-11-18 2025-11-18 ok
staging.wellfound.com 14 2026-04-22 2026-10-04 nodata
*.staging.wellfound.com 14 2026-04-22 2026-10-04 —
identification.staging.wellfound.com 7 2026-07-17 2026-09-14 ok
*.production-primary.internal.wellfound.com 5 2026-05-30 2026-09-27 —
ddm.wellfound.com 4 2026-05-18 2026-08-01 ok
identification.wellfound.com 4 2026-07-17 2026-09-07 ok
help.wellfound.com 5 2026-05-05 2026-09-02 ok
career.wellfound.com 3 2026-06-13 2026-08-27 ok
email.careerservices.wellfound.com 4 2026-04-12 2026-08-10 ok
landingpages.wellfound.com 8 2026-05-05 2026-08-31 ok
wellfound-announcement.wellfound.com 11 2026-06-02 2026-09-28 ok
recruiter-digest.wellfound.com 12 2026-05-01 2026-08-28 ok
wellfound-webflow.wellfound.com 11 2026-06-02 2026-09-28 ok

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