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.

12 hosts · 283 ms

HostCertsFirst seenLast seen
ongage.com 3 2026-03-10 2026-08-10
*.ongage.com 14 2025-07-05 2026-08-10
go.ongage.com 10 2026-05-10 2026-09-05
studio.ongage.com 10 2026-04-24 2026-08-20
docs.ongage.com 10 2026-05-10 2026-09-05
sales.ongage.com 4 2026-04-13 2026-08-11
os.ongage.com 5 2026-04-27 2026-08-27
api.os.ongage.com 10 2026-04-27 2026-08-23
openchat.ongage.com 3 2026-08-04 2026-10-05
support.ongage.com 5 2026-04-23 2026-08-21
academy.ongage.com 4 2026-06-04 2026-10-08
auth.academy.ongage.com 6 2026-06-04 2026-08-17

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