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.

14 hosts · 290 ms

HostCertsFirst seenLast seenDNS
fynk.com 31 2025-06-10 2026-10-04 ok
*.fynk.com 25 2025-06-10 2026-10-04 —
playground.fynk.com 1 2025-10-27 2025-10-27 nxdomain
featurebase.fynk.com 3 2026-09-29 2026-09-29 ok
staging.fynk.com 7 2026-08-21 2026-08-21 ok
ai-staging.fynk.com 1 2025-09-05 2025-09-05 nodata
ai.staging.fynk.com 1 2026-07-16 2026-07-16 ok
gw.staging.fynk.com 5 2026-08-21 2026-08-21 nxdomain
ai-production.fynk.com 1 2025-11-20 2025-11-20 nodata
echo.fynk.com 5 2026-05-02 2026-08-29 ok
help.fynk.com 16 2026-04-29 2026-08-25 ok
app.fynk.com 6 2026-08-25 2026-08-27 ok
ai.app.fynk.com 1 2026-07-22 2026-07-22 ok
gw.app.fynk.com 4 2026-08-25 2026-08-25 ok

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