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.

6 hosts · 337 ms

HostCertsFirst seenLast seenDNS
cocountant.com 22 2026-04-22 2026-09-10 ok
*.cocountant.com 14 2026-04-22 2026-08-19 —
get.cocountant.com 9 2026-05-26 2026-09-21 ok
www.cocountant.com 2 2026-06-04 2026-08-05 ok
pay.cocountant.com 6 2026-07-13 2026-09-10 ok
*.pay.cocountant.com 6 2026-07-13 2026-09-10 —

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