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 · 270 ms

HostCertsFirst seenLast seen
layersecurity.com 7 2026-05-27 2026-09-22
*.layersecurity.com 7 2026-05-27 2026-09-22
as4.layersecurity.com 8 2026-05-15 2026-10-01
stats.layersecurity.com 4 2026-04-20 2026-09-07

Programmatic access: API GET /v1/hosts/layersecurity.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/layersecurity.com.