Thank you for your feedback on this issue.
We have now researched this issue in detail.
If you don’t like GlassWire to do nslookups you can change the config file as recommended above. We’re considering adding a simple on/off switch for this feature in the future.
The way our nslookups work is that we use a standard Windows API to do an nslookup. In fact, if you do an nslookup in the Windows command prompt it works in an identical way. The reason we know this is because we checked this and confirmed it works the same way.
So, in summary, GlassWire does nslookups using a Windows API and it’s the same way the Windows command prompt does an nslookup. If you are unhappy with this you can disable nslookups with GlassWire using our config file.
Or, you can disable NetBIOS traffic with the Windows OS.
Right click the start menu > Network Connections > Right click your connection > properties > Click Internet Protocol Version 4 (TPC/IPv4) > Properties > Advanced… > WINS tab > Disable NetBIOS over TCP/IP
I think Remah also mentioned this option along with some other helpful commentary.