IoT Hub IP addresses
The IP address prefixes of IoT Hub public endpoints are published periodically under the AzureIoTHub service tag.
For devices that are deployed inside of on-premises networks, Azure IoT Hub supports VNET connectivity integration with private endpoints. For more information, see IoT Hub support for VNet.
You may use these IP address prefixes to control connectivity between IoT Hub and your devices or network assets in order to implement a variety of network isolation goals:
|Ensure your devices and services communicate with IoT Hub endpoints only||Device-to-cloud, and cloud-to-device messaging, direct methods, device and module twins and device streams||Use the AzureIoTHub service tag to discover IoT Hub IP address prefixes, then configure ALLOW rules on the firewall setting of your devices and services for these IP address prefixes. Traffic to other destination IP addresses will be dropped.|
|Ensure your IoT Hub device endpoint receives connections only from your devices and network assets||Device-to-cloud, and cloud-to-device messaging, direct methods, device and module twins, and device streams||Use IoT Hub IP filter feature to allow connections from your devices and network asset IP addresses. For details on restrictions, see the limitations section).|
|Ensure your routes' custom endpoint resources (storage accounts, service bus, and event hubs) are reachable from your network assets only||Message routing||Follow your resource's guidance on restricting connectivity; for example, via private links, service endpoints, or firewall rules. For details on firewall restrictions, see the limitations section).|
The IP address of an IoT hub is subject to change without notice. To minimize disruption, use the IoT hub hostname (for example, myhub.azure-devices.net) for networking and firewall configuration whenever possible.
For constrained IoT systems without domain name resolution (DNS), IoT Hub IP address ranges are published periodically via service tags before changes take effect. It’s therefore important that you develop processes to regularly retrieve and use the latest service tags. This process can be automated via the service tags discovery API. Note that the service tags discovery API is still in preview and, in some cases, may not produce the full list of tags and IP addresses. Until the discovery API is generally available, consider using service tags in downloadable JSON format.
Use the AzureIoTHub.[region name] tag to identify IP prefixes used by IoT Hub endpoints in a specific region. To account for datacenter disaster recovery or regional failover, ensure connectivity to IP prefixes of your IoT hub's geo-pair region is also enabled.
Setting up firewall rules in IoT Hub may block off connectivity needed to run Azure CLI and PowerShell commands against your IoT Hub. To avoid this, you can add ALLOW rules for your clients' IP address prefixes to re-enable CLI or PowerShell clients to communicate with your IoT Hub.
When adding ALLOW rules in your devices' firewall configuration, it’s best to provide specific ports used by applicable protocols.
Limitations and workarounds
IoT Hub IP filter feature has a limit of 100 rules. This limit and can be raised via requests through Azure Customer Support.
By default, your configured IP filtering rules are only applied on your IoT Hub IP endpoints and not on your IoT hub's built-in event hub endpoint. If you also require IP filtering to be applied on the event hub where your messages are stored, you may select the "Apply IP filters to the built-in endpoint" option in the IoT Hub Network settings. You can do the same thing by using your own Event Hubs resource where you can configure your desired IP filtering rules directly. In this case, you need to provision your own Event Hubs resource and set up message routing to send your messages to that resource instead of your IoT Hub's built-in event hub.
IoT Hub Service Tags only contain IP ranges for inbound connections. To limit firewall access on other Azure services to data coming from IoT Hub Message Routing, please choose the appropriate "Allow Trusted Microsoft Services" option for your service; for example, Event Hubs, Service Bus, Azure Storage.
Support for IPv6
IPv6 is currently not supported on IoT Hub.
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