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.

13 hosts · 294 ms

HostCertsFirst seenLast seenDNS
fun4uskids.com 11 2026-05-08 2026-09-19 ok
franchise23.fun4uskids.com 1 2026-04-09 2026-04-09 nxdomain
core5.fun4uskids.com 1 2026-04-10 2026-04-10 nxdomain
core6.fun4uskids.com 2 2026-06-30 2026-06-30 ok
core.fun4uskids.com 5 2026-05-06 2026-09-03 ok
bimi.fun4uskids.com 3 2026-07-08 2026-09-06 ok
newstrack.fun4uskids.com 2 2025-09-24 2026-08-25 ok
mail.fun4uskids.com 7 2026-04-26 2026-09-07 ok
webmail.fun4uskids.com 7 2026-04-26 2026-09-07 ok
members.fun4uskids.com 11 2026-05-18 2026-09-20 ok
test.fun4uskids.com 1 2026-04-10 2026-04-10 ok
memdev.fun4uskids.com 1 2026-04-10 2026-04-10 ok
frandev.fun4uskids.com 1 2026-04-10 2026-04-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fun4uskids.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/fun4uskids.com.