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 · 334 ms

HostCertsFirst seenLast seenDNS
chukar.com 20 2025-09-09 2026-09-25 ok
*.chukar.com 13 2026-05-04 2026-09-25 —
old.chukar.com 2 2026-04-27 2026-04-27 nxdomain
api.chukar.com 5 2026-04-29 2026-08-28 ok
trk.chukar.com 10 2026-04-14 2026-08-10 ok
account.chukar.com 5 2026-05-21 2026-09-18 ok
www.chukar.com 6 2025-09-09 2026-08-24 ok

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