How to determine the IP addresses and subnets if there’s no DHCP server

I tried to connect a network that has some clients with manually assigned IPs and no DHCP server at all, when I attach my PC to the network it just keeps sending DHCP DISCOVER packets without any reply and ends up with APIPA and become isolated because of the different subnets.

==My Question==
How can I know the subnets and the static IPs of the network that has no DHCP servers, since I can’t just try all the Private A,B and C class subnets one by one :).

And yes, thank you, I know that I can ask one of the already connected clients about their IP data and that’s what I’ve done, but I’ll appreciate a “network tool or method” to follow.
Thanks