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Modern network traffic classification puts much attention toward producing a granular classification of the traffic, such as at the application service level. However, the classification process is often impaired by the lack of granular network traffic ground truth. Granular network traffic ground truth is critical to provide a benchmark for a fair evaluation of modern network traffic classification. Nevertheless, in modern network traffic classification, existing ground truth tools only managed to build the ground truth at the application name level at most. Application name level granularity is quickly becoming insufficient to address the current needs of network traffic classification and therefore; this paper presents the design, development and experimental evaluation of Grano-GT, a tool to build a reliable and highly granular network traffic ground truth for encrypted browser-based traffic at the application name and service levels …