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.

16 hosts · 315 ms

HostCertsFirst seenLast seenDNS
pew.org 5 2026-01-06 2026-08-31 ok
*.pew.org 1 2026-01-06 2026-01-06 —
prod.pew.org 10 2026-04-19 2026-08-15 ok
cloud.pew.org 1 2026-05-05 2026-05-05 ok
image.pew.org 3 2025-12-11 2026-08-24 ok
click.pew.org 1 2026-05-11 2026-05-11 ok
uat.pew.org 8 2026-05-18 2026-09-13 ok
pre-uat.pew.org 5 2026-04-20 2026-10-04 ok
auth-uat.pew.org 5 2026-04-20 2026-10-04 ok
amp-uat.pew.org 11 2026-05-25 2026-09-20 ok
identityserver-uat.pew.org 5 2026-04-20 2026-10-04 ok
act.pew.org 1 2025-12-11 2025-12-11 ok
www.act.pew.org 1 2025-12-11 2025-12-11 ok
cftest.pew.org 10 2026-05-22 2026-09-17 ok
view.pew.org 1 2026-05-05 2026-05-05 ok
www.pew.org 11 2026-05-27 2026-09-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pew.org (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/pew.org.