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.

9 hosts · 310 ms

HostCertsFirst seenLast seenDNS
kits.com 34 2026-04-10 2026-10-06 ok
*.kits.com 34 2026-04-10 2026-10-06 —
i.kits.com 3 2026-05-15 2026-09-02 ok
help.kits.com 10 2026-05-09 2026-09-04 ok
*.camp.kits.com 18 2026-04-10 2026-10-04 —
ir.kits.com 8 2026-04-19 2026-08-15 ok
forms.kits.com 9 2026-06-01 2026-09-28 ok
*.camp.au.kits.com 5 2026-05-20 2026-09-17 —
*.camp.nz.kits.com 5 2026-05-20 2026-09-17 —

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