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.

22 hosts · 356 ms

HostCertsFirst seenLast seenDNS
unitedhealthcare.com 9 2026-02-16 2026-09-22 ok
data.aca.unitedhealthcare.com 2 2025-11-09 2025-11-09 ok
cdn.aca.unitedhealthcare.com 3 2026-02-04 2026-09-16 ok
lp.aca.unitedhealthcare.com 2 2025-11-12 2025-11-12 ok
pbsubscribe.unitedhealthcare.com 2 2025-09-11 2026-02-16 servfail
cloud.coverage.unitedhealthcare.com 2 2025-08-12 2026-07-31 ok
image.coverage.unitedhealthcare.com 2 2025-09-13 2026-10-01 ok
pbsubscribe-stage.unitedhealthcare.com 1 2025-09-02 2025-09-02 nxdomain
data.member.unitedhealthcare.com 2 2025-11-09 2025-11-09 ok
cdn.member.unitedhealthcare.com 3 2026-02-04 2026-09-16 ok
lp.member.unitedhealthcare.com 2 2025-11-12 2025-11-12 ok
cloud.housecalls.unitedhealthcare.com 1 2026-04-27 2026-04-27 ok
cloud.benefits.unitedhealthcare.com 1 2025-11-01 2025-11-01 ok
image.benefits.unitedhealthcare.com 1 2026-01-05 2026-01-05 ok
click.benefits.unitedhealthcare.com 1 2025-11-04 2025-11-04 ok
pages.benefits.unitedhealthcare.com 1 2025-11-01 2025-11-01 ok
view.benefits.unitedhealthcare.com 1 2025-11-01 2025-11-01 ok
data.planbenefits.unitedhealthcare.com 4 2026-03-28 2026-09-13 ok
cdn.planbenefits.unitedhealthcare.com 3 2026-02-04 2026-09-16 ok
ifp.planbenefits.unitedhealthcare.com 2 2025-10-29 2025-10-29 ok
pbsubscribe-dev.unitedhealthcare.com 3 2025-09-02 2026-08-25 ok
www.unitedhealthcare.com 7 2026-02-16 2026-09-17 ok

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