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.

21 hosts · 316 ms

HostCertsFirst seenLast seenDNS
baymard.com 27 2026-04-21 2026-09-27 ok
*.baymard.com 12 2026-04-21 2026-08-18 —
bridge.baymard.com 8 2026-05-18 2026-09-13 ok
base.baymard.com 10 2026-05-10 2026-09-06 ok
scoring.baymard.com 3 2026-06-08 2026-08-10 ok
data-api.baymard.com 10 2026-05-04 2026-08-30 ok
ask.baymard.com 12 2026-04-16 2026-08-12 ok
review-tool.baymard.com 5 2026-05-22 2026-09-22 ok
cdn.baymard.com 1 2026-01-07 2026-01-07 ok
admin.baymard.com 5 2026-05-24 2026-09-24 ok
review-tool-admin.baymard.com 5 2026-05-07 2026-09-08 ok
bridge-render.baymard.com 13 2026-05-28 2026-09-24 ok
feeds.baymard.com 7 2026-06-01 2026-09-30 ok
emails.baymard.com 5 2026-05-02 2026-08-30 ok
assets.baymard.com 1 2026-01-06 2026-01-06 ok
imgix-src-baymard-assets.baymard.com 10 2026-06-01 2026-09-27 ok
*.imgix-src-baymard-assets.baymard.com 10 2026-06-01 2026-09-27 —
status.baymard.com 1 2026-08-27 2026-08-27 ok
www.baymard.com 5 2026-05-15 2026-09-17 ok
scanify.baymard.com 5 2026-05-31 2026-09-30 ok
shopify.baymard.com 5 2026-05-27 2026-09-28 ok

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