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.

8 hosts · 357 ms

HostCertsFirst seenLast seenDNS
honor.org 15 2026-05-21 2026-09-27 ok
*.honor.org 10 2026-06-01 2026-09-27 —
swimforsof.honor.org 5 2026-05-30 2026-09-17 ok
swim.honor.org 7 2026-05-29 2026-09-17 ok
shop.honor.org 13 2026-05-17 2026-09-26 ok
careers.honor.org 1 2025-12-02 2025-12-02 ok
support.honor.org 12 2026-04-16 2026-08-12 ok
www.honor.org 5 2026-05-21 2026-09-09 ok

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