If port 135/TCP is open between your Lansweeper server and those machines, Lansweeper should have generated asset pages for them if you performed an
IP range scan or
Workgroup scan. Open Assets and filter for assets which are not part of your domain. Alternatively run a report like the following (replace "YourDomain" with the NetBIOS name of your own domain).
Select tblAssets.Domain,
tblAssets.AssetID,
tblAssets.AssetName,
tblAssets.IPAddress,
tblAssets.Lastseen
From tblAssets
Where tblAssets.Domain Not Like 'YourDomain' And tblAssets.Assettype = -1
Order By tblAssets.Domain,
tblAssets.AssetName