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 · 159 ms

HostCertsFirst seenLast seen
te.newyorklife.com 2 2025-09-22 2026-08-11
m.te.newyorklife.com 2 2025-09-22 2026-08-11
res.te.newyorklife.com 2 2025-09-22 2026-08-11
t.te.newyorklife.com 2 2025-09-22 2026-08-11

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