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.

11 hosts · 321 ms

HostCertsFirst seenLast seenDNS
yonder.com 14 2026-04-10 2026-10-05 ok
web.yonder.com 5 2026-04-28 2026-08-31 ok
web-staging.yonder.com 5 2026-04-26 2026-08-31 ok
partners-staging.yonder.com 5 2026-04-22 2026-08-24 ok
help-nl.yonder.com 11 2026-05-28 2026-09-23 ok
hotels.yonder.com 1 2025-11-25 2025-11-25 ok
www.hotels.yonder.com 1 2025-11-25 2025-11-25 nxdomain
partners.yonder.com 5 2026-04-22 2026-08-23 ok
auth.partners.yonder.com 6 2026-06-16 2026-08-14 ok
waitlist.yonder.com 12 2026-05-03 2026-08-29 ok
www.yonder.com 12 2026-05-02 2026-08-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/yonder.com (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/yonder.com.