There's a problem with the version 3.9 on macOS. The column for the MAC addresses don't work anymore. All it says is n/a for all machines that reply on the ping.

The two systems I've tested this are macOS 12.6.2 on Intel and 13.1 on Apple Silicon.

Now for the interesting part: MAC addresses do work with 3.8.2 on both systems with Eclipse Adoptium 17.0.5+8 as JRE.

Ping method is set to "Java built-in" in both versions.