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.

23 hosts · 352 ms

HostCertsFirst seenLast seenDNS
headsetadvisor.com 42 2026-04-11 2026-10-02 ok
*.headsetadvisor.com 22 2026-04-11 2026-10-02 —
scc.headsetadvisor.com 15 2026-04-15 2026-09-26 ok
rc.headsetadvisor.com 10 2026-04-29 2026-08-25 ok
quote.headsetadvisor.com 15 2026-05-22 2026-09-25 ok
archive.headsetadvisor.com 2 2026-09-29 2026-09-29 ok
*.staging.headsetadvisor.com 12 2026-05-10 2026-09-05 —
li.headsetadvisor.com 5 2026-07-27 2026-09-25 ok
*.api.headsetadvisor.com 12 2026-05-10 2026-09-05 —
*.staging.api.headsetadvisor.com 12 2026-05-10 2026-09-05 —
track.headsetadvisor.com 14 2026-04-14 2026-08-14 ok
portal.headsetadvisor.com 1 2026-09-02 2026-09-02 ok
go.headsetadvisor.com 9 2026-04-17 2026-08-13 ok
dp.headsetadvisor.com 4 2026-05-26 2026-05-26 ok
offer.headsetadvisor.com 7 2026-04-22 2026-06-21 ok
partners.headsetadvisor.com 3 2026-04-16 2026-08-18 ok
www.partners.headsetadvisor.com 3 2026-04-16 2026-08-18 ok
support.headsetadvisor.com 4 2026-04-21 2026-08-19 ok
aden-review.headsetadvisor.com 6 2026-06-20 2026-08-18 ok
*.aden-review.headsetadvisor.com 6 2026-06-20 2026-08-18 —
www.headsetadvisor.com 13 2026-05-18 2026-09-29 ok
pay.headsetadvisor.com 3 2026-06-24 2026-08-23 ok
compatibility.headsetadvisor.com 5 2026-07-31 2026-09-28 ok

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