VertNet uses the Integrated Publishing Toolkit (IPT) to host published biodiversity data on the VertNet IPT for its participating institutions. The IPT is a free, open source web application designed to publish primary occurrence data, species checklists and taxonomies, and associated dataset metadata available for use on the Internet. Data are published as web-based Darwin Core Archives (simple ZIP files that contain tab-delimited or comma-separated text files organized using the Darwin Core Standard).