A subdomain whose CNAME points at a deleted cloud resource (S3 bucket, Azure web app, GitHub Pages site, etc.) can be re-registered by anyone, who then serves content — with valid TLS — on your own domain. Prime phishing and cookie-theft infrastructure.
A scan reports where your tenant stands on this check — pass, fail with a step-by-step fix, or not applicable if your licensing doesn’t include the feature. When Tenant Strike can’t read a setting with read-only access, it says unverified and gives you a one-command way to confirm it yourself — it never guesses.
Related External Attack Surface checks
Check your own tenant
Is your tenant covered on "remove dangling dns records"?
One read-only scan answers it — this check and every other one in the catalog, each with a plain-English fix. 7-day Pro trial, no credit card.