Genomic locations are represented as coordinates on a specific genome build version, but the build information is frequently missing when coordinates are provided. This tool accompanies our manuscript that discussed the importance of genome build information in correctly interpreting and analysing the genomic track files. Although not a substitute for the best practices, this tool attempts to predict the genome build version of genomic track files, if any of the sequence coordinates in the input track file are unique to a genome build version. This tool builds upon the strengths of existing Bioconductor packages that enable scalable genomic analyses to predict the genome build version of genomic track files. For more information about scalable genomics with Bioconductor, see references [1,2]. As an alternative to this R package, we also provide the tool through a web-interface, which supports more species. For more information, see here: http://hyperbrowser.uio.no/refgenome