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.

2 hosts · 242 ms

HostCertsFirst seenLast seen
manage.synergywholesale.com 10 2026-05-16 2026-09-18
*.manage.synergywholesale.com 5 2026-05-16 2026-09-03

Programmatic access: API GET /v1/hosts/manage.synergywholesale.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/manage.synergywholesale.com.