Azure Analysis Services does not use fixed IP addresses or Service Tags. The range of IP addresses your Analysis Services servers use can be anything in the range of IP addresses for the *Azure region*. You have to provide the *full range* of IP addresses for the Azure region of your server in the source database firewall rules. Another, and possibly more secure, alternative is to configure an On-premises Data Gateway. You can then configure your Analysis Services servers with the [AlwaysUseGateway server property](analysis-services-vnet-gateway.md#configure-alwaysusegateway-property), and then ensure the On-premises Data Gateway has an IP address allowed by the firewall rules of the data source.
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