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.

9 hosts · 274 ms

HostCertsFirst seenLast seenDNS
bigstockphoto.com 21 2025-10-21 2026-09-28 ok
*.bigstockphoto.com 23 2025-10-21 2026-09-28 —
qa.bigstockphoto.com 15 2025-10-07 2026-09-19 nxdomain
*.qa.bigstockphoto.com 18 2025-10-07 2026-09-19 —
support.qa.bigstockphoto.com 13 2025-08-13 2026-09-19 nxdomain
vip-go.bigstockphoto.com 5 2026-05-07 2026-09-08 ok
support.bigstockphoto.com 13 2025-08-12 2026-09-21 ok
dev.bigstockphoto.com 28 2025-09-23 2026-09-29 nxdomain
*.dev.bigstockphoto.com 32 2025-07-01 2026-09-29 —

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