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.

8 hosts · 260 ms

HostCertsFirst seenLast seenDNS
krispcall.com 20 2026-04-21 2026-09-17 ok
*.krispcall.com 14 2026-04-21 2026-09-17 —
aaula.krispcall.com 3 2026-03-31 2026-08-31 ok
june.krispcall.com 2 2026-07-27 2026-07-27 nxdomain
staging.krispcall.com 8 2026-05-13 2026-09-12 ok
help.krispcall.com 5 2026-05-23 2026-09-20 ok
status.krispcall.com 5 2026-05-08 2026-09-06 ok
try.krispcall.com 10 2026-04-14 2026-08-10 ok

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