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.

6 hosts · 286 ms

HostCertsFirst seenLast seenDNS
squarepeg.vc 20 2026-04-09 2026-10-03 ok
*.squarepeg.vc 6 2026-04-29 2026-09-27 —
foundersummit2026.squarepeg.vc 5 2026-06-03 2026-10-01 ok
email.foundersummit2026.squarepeg.vc 6 2026-06-03 2026-10-01 ok
www.squarepeg.vc 8 2026-04-13 2026-08-09 ok
helix.squarepeg.vc 3 2025-06-11 2026-05-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/squarepeg.vc (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/squarepeg.vc.