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.

5 hosts · 355 ms

HostCertsFirst seenLast seenDNS
squaregroup.com 1 2025-12-03 2025-12-03 ok
*.squaregroup.com 1 2025-12-03 2025-12-03 —
edcrspplc.squaregroup.com 3 2026-05-14 2026-08-10 ok
edcrke.squaregroup.com 4 2026-04-20 2026-08-19 ok
textile.squaregroup.com 5 2026-05-23 2026-09-22 ok

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