Soracom service endpoints, such as the Unified Endpoint (uni.soracom.io) and Soracom Harvest (harvest.soracom.io), currently use static IP addresses within the Soracom network (for example, 100.127.111.111).
However, as noted in the Service Endpoints documentation, while Soracom has not changed these IP addresses since launch, there is no guarantee that they will not change in the future.
If you choose to configure your device with a static IP address (for example, to reduce data usage from DNS lookups), ensure that you can update the configuration if the IP address changes, or configure the device to periodically refresh the IP address via DNS.