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 · 268 ms

Download CSV
HostCertsFirst seenLast seen
ua-auto-config.mobi.com 1 2026-10-15 2026-10-15
autoconfig.mobi.com 1 2026-10-15 2026-10-15
wiki.mobi.com 1 2025-07-06 2025-07-06
autodiscover.mobi.com 1 2026-10-15 2026-10-15
mta-sts.mobi.com 1 2026-10-15 2026-10-15

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