The ClAnSort (Cluster-Analysis and Sort) - program was written to simplify the analysis of Next Generation Sequencing (NGS) data obtained with Ion Torrent™ Technology using the BIOMED-2 Concerted Action BMH4-CT98-3936 primer sets (IGH, IGK, TRB, TRG and TRD) for amplification [van Dongen, J.J. et al., 2003].