You need to know the IP address range of the network you wish to scan. For a local network, this is commonly something like 192.168.1.0/24 . For scanning the public IP addresses of a specific internet provider or geographic area, online services can help compile these ranges.
The (Stas’M) discontinued it in 2019, but v2.60 continues spreading via torrents and hacking forums. Legit pentesters now use: router scan v2 60
System administrators and ethical hackers use Router Scan to discover unauthorized "rogue" routers attached to an enterprise network. It allows IT teams to quickly identify which corporate routers are running outdated firmware or utilizing weak, default passwords that violate security policies. The Threat of Malicious Exploitation You need to know the IP address range