Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 287 ms

HostCertsFirst seenLast seen
e.newyorklife.com 3 2025-08-08 2026-07-14
m.e.newyorklife.com 3 2025-08-08 2026-07-14
res.e.newyorklife.com 3 2025-08-08 2026-07-14
t.e.newyorklife.com 3 2025-08-08 2026-07-14

Programmatic access: API GET /v1/hosts/e.newyorklife.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.newyorklife.com.