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 · 341 ms

HostCertsFirst seenLast seenDNS
flash-payments.com 9 2026-03-01 2026-08-31 ok
*.flash-payments.com 4 2026-03-01 2026-08-30 —
blog.flash-payments.com 6 2026-06-19 2026-09-27 ok
developer.flash-payments.com 10 2026-05-08 2026-09-04 ok
status.flash-payments.com 10 2026-06-05 2026-10-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/flash-payments.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/flash-payments.com.