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If you are looking for how many devices are connected to your RUT240. You will find all the information: Open WebUI then Status / Network / LAN or Wireless depending on your devices connection type.
For more information, you can check Wiki article: https://wiki.teltonika.lt/view/RUT240_Network#LAN
You can try WebUI then Status / Network / Topology you will get more in-depth network information. And if you are using the firmware with new WebUI - in Networks / Routes you should find the ARP table.