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.

5 hosts · 347 ms

HostCertsFirst seenLast seenDNS
weareedwards.com 5 2026-05-21 2026-09-22 ok
edge.weareedwards.com 1 2026-09-23 2026-09-23 ok
learnmore.weareedwards.com 1 2026-09-11 2026-09-11 ok
stream.weareedwards.com 1 2026-08-28 2026-08-28 ok
www.weareedwards.com 5 2026-05-20 2026-09-23 ok

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