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Nabs is a network monitoring platform. Nabs currently collects, visualizes, and archives flow records from its sensors for the monitoring and enforcement of use policies. The sensors use statistical properties of packet payloads to robustly identify content carried by network flows. The sensors do not depend on well-known port bindings or application specific headers to determine the type of content. This allows a network administrator to author and enforce a use policy based on bandwidth and type of content in transit. The sensors have been tested on OC3 lines and work is ongoing to scale them to higher speeds.