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 · 310 ms

HostCertsFirst seenLast seenDNS
web.e.equifax.com 1 2026-09-29 2026-09-29 ok
image.e.equifax.com 4 2025-09-01 2026-10-01 ok
click.e.equifax.com 2 2026-01-25 2026-01-26 ok
pages.e.equifax.com 2 2026-03-03 2026-08-05 ok
view.e.equifax.com 1 2026-01-20 2026-01-20 ok

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