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.

5 hosts · 336 ms

Download CSV
HostCertsFirst seenLast seen
synergeticpress.com 19 2026-04-30 2026-09-22
*.synergeticpress.com 13 2026-04-30 2026-09-22
mta-sts.synergeticpress.com 2 2026-05-01 2026-05-01
www.mta-sts.synergeticpress.com 2 2026-05-01 2026-05-01
www.synergeticpress.com 5 2026-05-14 2026-09-11

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