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.

8 hosts · 344 ms

HostCertsFirst seenLast seenDNS
xflowpay.com 10 2025-06-27 2026-09-01 ok
*.xflowpay.com 6 2025-06-27 2026-09-01 —
beta.xflowpay.com 4 2026-04-17 2026-08-20 ok
ai.xflowpay.com 4 2026-06-04 2026-10-07 ok
demo.xflowpay.com 4 2026-04-17 2026-08-18 ok
mcp.xflowpay.com 5 2026-05-21 2026-09-20 ok
preview.xflowpay.com 4 2026-04-16 2026-08-19 ok
www.xflowpay.com 8 2025-09-30 2026-08-18 ok

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