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.

3 hosts · 222 ms

HostCertsFirst seenLast seenDNS
ikea.co 9 2026-05-19 2026-09-14 ok
go.ikea.co 17 2026-06-04 2026-09-30 ok
www.ikea.co 10 2026-04-13 2026-08-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/ikea.co (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/ikea.co.