My initial thought would be to use NCM to run a report that would pull the NTA desitnation from your devices...
Without NCM, I would probably want to go digging through the Fastbit Database. I do not have an additional poller to confirm, but this might get what you're looking for. Just make a web report and set this as the SWQL datasource
SELECT s.OrionSite.Name AS [POLLING ENGINE] ,n.Caption AS [NODE] ,s.Interface.Caption AS [INTERFACE] FROM Orion.Netflow.Source s JOIN Orion.Nodes n ON n.NodeID = s.Interface.NodeID ORDER BY s.OrionSite.Name, n.Caption, s.Interface.Caption
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