Is it possible to automatically find all local networks?

Question

Computer networks

For example DHCP issues IP 192.168.1 . 214, mask 255.255.255.0, gateway 192.168.1.1
I will be able to see the PC only in the range 192.168.1.1/24
If I write the IP statically 192.168 . 0 . 54 or even 10.11.0.218
Then I can find all devices in these ranges
I need to scan all local ranges from 10.x.x.x to 192.168.x.x
Is there software that will automatically change the IP + Gateway in the network interface and scan all devices?
Or how can you go beyond the aisles of one local network and get through to others?

Answer 1

If the network has a properly configured gateway and architecture, then there is no way

Answer 2

If you are a local admin, and it seems to be the case, since you can change the network address, then
1) you can install and turn on a sniffer for 10-15 minutes, which will catch all broadcast packets and, with a high probability, all existing local network; this is usually enough in most cases;
2) develop the idea of ​​low-level access further and install some software that will generate broadcast requests on behalf of non-existent IPs in different networks on behalf of your MAC; you do not need to change the settings of the local network card - the OS simply will not process such packets, they will go directly to the address of the network card driver to be sent "on the wire".

Answer 3

You are doing bullshit. Just register correctly routing.