For most customers using a content delivery network (CDN), the IP address in the waterfall chart is the IP of the CDN server that is delivering the content. From this IP address, you should be able to determine which objects came from your CDN and which come directly from your servers.
If you are looking to see where your CDN obtains the information from your servers, you can spot-check the IP address from a node using our Instant Test tool, NS Lookup. To access this tool in the Dynatrace Portal, select Monitor & Analyze > Diagnostic Utilities from the Portal's menu bar. For more information about Instant Tests, see Diagnostics in the documentation.