Network security visualization tool plays an important role in the network security filed. It's considered the first line of defense because it provides security analysts with visualized network information we need to either prevent or investigate an attack, an intrusion, an anomalous activity and much more. In this paper, we briefly describe the 13 network visualization tools we surveyed and we outline their advantages and disadvantages. We employ qualitative coding as part of our research design or framework to extract some metrics from the list of advantages and disadvantages of the tools to help us design an evaluation methodology, which we plan to use to measure the effectiveness of the visualization tools through usability studies.