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.

3 hosts · 231 ms

HostCertsFirst seenLast seen
plasbit.com 1 2025-11-25 2025-11-25
*.plasbit.com 3 2025-11-25 2026-09-13
mta-sts.plasbit.com 5 2026-05-26 2026-09-23

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