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.

9 hosts · 319 ms

HostCertsFirst seenLast seenDNS
leadfeeder.com 8 2025-10-02 2026-09-27 ok
*.leadfeeder.com 8 2025-10-02 2026-09-27 —
marketing.leadfeeder.com 1 2025-12-26 2025-12-26 ok
wiki.leadfeeder.com 3 2026-04-28 2026-08-14 ok
hello.leadfeeder.com 3 2026-06-23 2026-08-06 ok
status.leadfeeder.com 6 2026-05-22 2026-09-18 ok
get.leadfeeder.com 10 2026-05-12 2026-09-07 ok
sst.leadfeeder.com 5 2026-05-17 2026-09-14 ok
www.leadfeeder.com 2 2025-07-18 2026-06-17 ok

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