Mark, You will need to open up a support case and have a feature request opened for this Item. I am not sure the types of devices you have but a couple thoughts. If you don't have your windows servers event logs being sent to Splunk this would send along the netbios information. You could also setup a WINS server to capture everything? http://docs.splunk.com/Documentation/SplunkCloud/6.6.3/Data/MonitorWindowseventlogdata
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