What if your device has a host name instead of an IP address?
Sometimes the Ethernet devices you need to communicate with do not have a fixed IP address. This is a common challenge in telemetry applications for water/wastewater, oil/gas, and other industries with widely distributed control systems.
When using cellular modems to communicate to remote devices the cellular carrier often charges per-device monthly fees to obtain a fixed IP address for every device in your system. The fees associated with paying for fixed IP addresses for a large number of devices can add up quickly.