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How to find external device's subnet when IP is known?

Hi all,

Ignore my ignorance if it shows.. I've tried the best I could for the last few days, but I've had no luck. And this is pretty out of my depth.

In short, I bought a used Cognex camera off of a local business that decommissioned a warehouse, powered it up, all looked good, but the camera's software explorer couldn't find it. I assume that someone disabled the DHCP on the camera and switched it to a static IP.

Using wireshark, I found the static IP locally via a broadcast (It's 192.168.0.224), so I changed my ethernet IPv4 to be close to it (192.168.0.228), and the subnet mask as (255.255.0.0). But the camera can still not found and I get a "host unreachable" when I try to ping the device via cmd.. i think the subnet mask is wrong? I've read that there's a way to find the range, and tried, but I couldn't figure it out. Could something else be the issue?

Thanks for the help ahead of time, Christian