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.

4 hosts · 332 ms

HostCertsFirst seenLast seenDNS
sherwood.news 1 2025-12-09 2025-12-09 ok
*.sherwood.news 1 2025-12-09 2025-12-09 —
link.sherwood.news 5 2026-05-05 2026-09-02 ok
join.sherwood.news 12 2026-04-25 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sherwood.news (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/sherwood.news.