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.

18 hosts · 344 ms

HostCertsFirst seenLast seenDNS
happydad.com 42 2026-04-24 2026-10-01 ok
*.happydad.com 10 2026-05-04 2026-09-30 —
find.happydad.com 3 2026-06-15 2026-06-15 ok
employee.happydad.com 5 2026-05-09 2026-09-10 ok
auth.happydad.com 10 2026-04-25 2026-08-22 ok
circlek.happydad.com 5 2026-04-22 2026-08-20 ok
lnk.happydad.com 5 2026-05-20 2026-10-05 ok
portal.happydad.com 5 2026-05-23 2026-09-23 ok
iframe-mdm.happydad.com 14 2026-05-14 2026-09-09 ok
login.happydad.com 10 2026-04-30 2026-08-27 ok
shop.happydad.com 13 2026-05-21 2026-10-01 ok
distributor.happydad.com 5 2026-05-22 2026-09-23 ok
jobs.happydad.com 8 2026-04-24 2026-08-20 ok
forms.happydad.com 4 2026-04-17 2026-08-17 ok
sms.happydad.com 10 2026-05-10 2026-09-06 ok
assets.happydad.com 11 2026-05-18 2026-09-28 ok
account.happydad.com 12 2026-04-20 2026-10-01 ok
www.happydad.com 16 2026-05-22 2026-10-03 ok

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