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.

7 hosts · 231 ms

HostCertsFirst seenLast seen
esputnik.com 1 2025-11-11 2025-11-11
*.esputnik.com 1 2025-11-11 2025-11-11
docs-ua.esputnik.com 9 2026-05-28 2026-09-24
status-http.esputnik.com 5 2026-05-24 2026-09-27
docs.esputnik.com 16 2026-04-28 2026-08-24
webinars.esputnik.com 5 2026-06-01 2026-09-30
get.esputnik.com 5 2026-04-25 2026-08-23

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