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.

7 hosts · 260 ms

HostCertsFirst seenLast seenDNS
seva.org 3 2026-02-19 2026-02-21 ok
lac.seva.org 5 2026-06-16 2026-08-28 ok
blog.seva.org 5 2026-06-02 2026-08-28 ok
tech.seva.org 5 2026-06-16 2026-08-28 ok
edroundup.seva.org 5 2026-05-25 2026-09-07 ok
www.edroundup.seva.org 5 2026-05-30 2026-09-12 ok
www.seva.org 3 2026-02-19 2026-02-21 ok

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