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.

8 hosts · 272 ms

HostCertsFirst seenLast seen
zengo.com 17 2026-04-16 2026-09-23
*.zengo.com 20 2025-11-22 2026-09-23
app-prod.zengo.com 1 2026-01-19 2026-01-19
link.zengo.com 1 2026-09-14 2026-09-14
link.email.zengo.com 1 2025-12-30 2025-12-30
go.zengo.com 16 2026-05-04 2026-08-31
bitrawr.zengo.com 2 2026-05-04 2026-10-04
clicks.zengo.com 2 2026-03-13 2026-07-29

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