Microsoft publishes Azure service tags and downloadable JSON for public IP ranges used by Azure services (distinct from Bing or M365 unless included in the same file).
Autonomous systems (ASNs)
Known ASNs used by Microsoft Azure.
AS8075
AS12076
Azure service tags & public IPs
Official feedDownload Center filename includes a date stamp that changes each weekly release — fetch the current ServiceTags_Public file.
Azure CDN & Front Door - backend allowlisting
DocumentationUse AzureFrontDoor.Backend (and the service-tag JSON) for origin allowlisting. Azure CDN from Edgio retired Jan 2025; classic Microsoft CDN has a 2027 retirement milestone.