If you would like to list assets which have been detected during the last 24 hours, you could use the filter
> GetDate() - 1
in field
tblAssets.Firstseen. Please find a full example report query below:
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tsysIPLocations.IPLocation,
tblAssets.Firstseen,
tblAssets.Lastseen,
tblAssets.Lasttried
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Left Join tsysIPLocations On tblAssets.IPNumeric >= tsysIPLocations.StartIP
And tblAssets.IPNumeric <= tsysIPLocations.EndIP
Where tblAssets.Firstseen > GetDate() - 1 And tblAssetCustom.State = 1
Order By tblAssets.Firstseen Desc