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You can use Conditional Access to restrict access to login to the Azure portal from specific IP addresses:
https://learn.microsoft.com/en-us/azure/active-directory/conditional-access/location-condition
Or for specific resources, you can configure IP whitelisted, through the Firewall rules. An example is Azure storage accounts: https://learn.microsoft.com/en-us/azure/storage/common/storage-network-security?tabs=azure-portal