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 · 278 ms

HostCertsFirst seenLast seenDNS
ikea.sg 9 2026-05-20 2026-09-15 ok
go.ikea.sg 11 2026-06-05 2026-10-01 ok
www.ikea.sg 12 2026-04-12 2026-10-07 ok

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