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.

7 hosts · 216 ms

HostCertsFirst seenLast seen
swisco.com 17 2026-04-15 2026-10-07
*.swisco.com 17 2025-10-28 2026-09-28
vpn.swisco.com 5 2026-05-27 2026-09-23
metrics.swisco.com 4 2026-05-29 2026-09-14
www.metrics.swisco.com 3 2026-05-09 2026-08-27
images.dev.swisco.com 3 2025-10-28 2026-09-28
www.swisco.com 2 2026-04-15 2026-10-07

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