Hi,
This IP address range is used by Microsoft Azure Platform services and it is one of the critical IP address, I will suggest you to investigate what and where exactly it is taking up CPU load, this range is assigned to AzureCloud.eastus2 region.
The range is used by Azure for API and Network Security Group service tags.
Explore more on the range over here by downloading the latest IP address file. https://www.microsoft.com/en-us/download/details.aspx?id=56519
Hope this helps.
JS
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