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.

9 hosts · 236 ms

Download CSV
HostCertsFirst seenLast seen
swissamerica.com 5 2026-06-04 2026-10-02
media.swissamerica.com 5 2026-05-24 2026-09-22
blog.swissamerica.com 4 2026-06-15 2026-10-15
staging.blog.swissamerica.com 5 2026-05-27 2026-09-25
m.swissamerica.com 5 2026-05-24 2026-09-22
mato.swissamerica.com 5 2026-05-24 2026-09-22
nlsender.swissamerica.com 3 2025-08-07 2026-08-10
www.nlsender.swissamerica.com 3 2025-08-07 2026-08-10
www.swissamerica.com 5 2026-06-04 2026-10-02

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