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.

20 hosts · 222 ms

HostCertsFirst seenLast seen
zentera.net 6 2026-03-07 2026-09-04
*.zentera.net 1 2026-03-07 2026-03-07
auth0test0.zentera.net 10 2026-05-01 2026-08-27
aptk1.zentera.net 11 2026-04-18 2026-10-04
unlv.blackfire.zentera.net 8 2026-05-07 2026-07-27
billing.zentera.net 11 2026-05-23 2026-09-20
agent-catalog.zentera.net 5 2026-06-06 2026-10-04
link.zentera.net 5 2026-05-13 2026-09-10
z1.demo.zentera.net 2 2026-03-24 2026-08-24
web1.z1.demo.zentera.net 2 2026-03-26 2026-08-26
web2.z1.demo.zentera.net 2 2026-03-26 2026-08-26
acme2.demo.zentera.net 3 2026-05-19 2026-08-17
z2.demo.zentera.net 2 2026-03-30 2026-08-30
web1.z2.demo.zentera.net 2 2026-03-30 2026-08-30
web2.z2.demo.zentera.net 2 2026-03-30 2026-08-30
acme.demo.zentera.net 3 2026-05-19 2026-09-01
kevin.demo.zentera.net 1 2025-08-15 2025-08-15
support.zentera.net 5 2026-05-15 2026-09-12
trust.zentera.net 14 2026-06-06 2026-10-03
www.zentera.net 12 2026-04-24 2026-08-21

Programmatic access: API GET /v1/hosts/zentera.net (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/zentera.net.