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 · 347 ms

HostCertsFirst seenLast seenDNS
gridandpixel.net 10 2026-04-25 2026-09-24 ok
*.gridandpixel.net 10 2026-04-25 2026-09-24 —
inst.gridandpixel.net 4 2026-04-17 2026-08-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gridandpixel.net (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/gridandpixel.net.