SMALLEST AND LARGEST SUBNET SIZE IN AZURE

What is the smallest and largest subnet in Azure?

The smallest subnet in Azure is /29. So theoretically you have 8 IPs in subnet but Azure reserve 5 IPs so you will only get 3 IPs for yourself.

While the largest subnet in Azure is /8 . 5 IPs are reserved in this also.

Refer this post to know how to calculate the total number of IPs available in a subnet.

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You can get more details on this page of Azure site .