A friend of my lately introduced to tools called advanced IP scanner. It a great tool. It basically scans all addresses to check the address of device even if this device is not in our network. When I connect a device on my computer and I don't know its IP address. If the device has 184.108.40.206 or 3.3.3 or 220.127.116.11 18.104.22.168 this tool will find it. A tool like Nmap works to find it if I know the range where my device could be.
I was wondering if there is a Linux alternative for this tool.