Mash (citation) is a software for fast genome distance estimation and contamination screening using the MinHash algorithm. It supports two different commands:

Mash Distance

Rapid estimation of the distance between genomes

Used in Ridom Typer for rapid species identification and automatic project choosing in pipeline

Mash Screen

Rapid screening of sequence containment in (meta-)genome data

Used in Ridom Typer for species contamination check

For both, Ridom Typer comes with a Mash reference database (sketch size of s=1,000 and k=21) that contains all prokaryotic NCBI RefSeq Genome entries with status complete or chromosome that were filtered for taxonomic reliable genus and species information (30,547 genomes, as of September 2023).