The ability to bring your own public IPv4 ranges using a global/regional configuration is already available in all public and US government regions. We are announcing that you can now bring a “global” IPv4 range (as small as /24) to Azure that will be advertised from Microsoft WAN and then divide this range into multiple “regional” ranges (as small as /26) associated with a specific region. This allows you to onboard a single range that can be used across multiple regions for redundancy.
Learn more about Custom IP Prefixes.