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 · 287 ms

HostCertsFirst seenLast seenDNS
myjobhelper.com 5 2026-05-14 2026-09-11 ok
*.myjobhelper.com 5 2026-05-14 2026-09-11 —
job.myjobhelper.com 5 2026-05-28 2026-09-22 ok
cc.myjobhelper.com 5 2026-05-15 2026-09-06 ok
testing.myjobhelper.com 5 2026-05-18 2026-09-15 ok
*.testing.myjobhelper.com 5 2026-05-18 2026-09-15 —
*.jobs.myjobhelper.com 5 2026-05-14 2026-09-11 —
jobresults.myjobhelper.com 3 2026-06-12 2026-09-01 ok
img.alerts.myjobhelper.com 2 2026-08-30 2026-08-30 ok
ilink.alerts.myjobhelper.com 2 2025-09-09 2026-08-09 ok
trk.alerts.myjobhelper.com 4 2025-09-08 2026-08-30 ok
clicks.alerts.myjobhelper.com 5 2026-05-14 2026-09-11 ok
www.myjobhelper.com 5 2026-05-28 2026-09-22 ok

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