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.

10 hosts · 292 ms

HostCertsFirst seenLast seenDNS
firearmspolicy.org 5 2026-05-23 2026-09-11 ok
secure.firearmspolicy.org 10 2026-05-04 2026-08-30 ok
email.firearmspolicy.org 6 2026-07-10 2026-09-07 ok
www.membership.firearmspolicy.org 8 2026-04-20 2026-08-17 ok
shop.firearmspolicy.org 17 2026-05-16 2026-09-25 ok
gear.firearmspolicy.org 10 2026-05-21 2026-09-16 ok
grassroots.firearmspolicy.org 5 2026-05-10 2026-09-02 ok
www.grassroots.firearmspolicy.org 5 2026-05-10 2026-09-02 ok
mta-sts.firearmspolicy.org 5 2026-05-20 2026-09-17 ok
www.firearmspolicy.org 15 2026-04-21 2026-09-11 ok

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