Community Detection Algorithms for Darknet Traffic Analysis Today the diffusion of internet is widespread and so the defence from cyber-attacks is very relevant. Among the possible attacks there are large-scale network probing activities and DDoS (Distributed Denial of Service). One way to defend ourselves is to detect and predict via passive monitoring, keeping track of the traces of attacks that are collected by the Darknets: backscattering packets and port scans. Darknets are range of advertised, but unused, IP addresses, studying the darknet traffic at our disposal we try to propose a simple way to cluster, visualize and analyse the spurious data.