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.

2 hosts · 293 ms

HostCertsFirst seenLast seenDNS
url5019.autodeskcommunications.com 2 2025-09-08 2026-05-31 ok
mta-sts.autodeskcommunications.com 1 2026-09-03 2026-09-03 ok

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