Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 332 ms

HostCertsFirst seenLast seenDNS
vivanmn.com 13 2026-05-12 2026-09-21 ok
sviva.vivanmn.com 1 2026-04-12 2026-04-12 nxdomain
hub.vivanmn.com 1 2026-09-07 2026-09-07 ok
dash.vivanmn.com 1 2026-08-17 2026-08-17 ok
app-api.vivanmn.com 1 2026-08-12 2026-08-12 ok
login.vivanmn.com 2 2026-09-30 2026-09-30 ok
s.vivanmn.com 2 2026-09-27 2026-09-27 ok
account.vivanmn.com 11 2026-04-12 2026-09-25 ok
www.vivanmn.com 13 2026-05-12 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/vivanmn.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/vivanmn.com.