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.

10 hosts · 281 ms

HostCertsFirst seenLast seen
zettascale.tech 8 2025-09-19 2026-09-04
*.zettascale.tech 2 2026-09-04 2026-09-04
www2.zettascale.tech 8 2026-04-20 2026-08-18
download.zettascale.tech 2 2026-09-11 2026-09-11
kbase.zettascale.tech 10 2026-06-05 2026-09-03
*.kbase.zettascale.tech 2 2026-09-03 2026-09-03
www.kbase.zettascale.tech 2 2026-09-03 2026-09-03
link.zettascale.tech 2 2026-04-28 2026-04-28
files.zettascale.tech 5 2026-05-27 2026-09-25
www.zettascale.tech 8 2025-09-19 2026-09-04

Programmatic access: API GET /v1/hosts/zettascale.tech (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/zettascale.tech.