  Although topological invariants have been introduced to classify the
appearance of protected electronic states at surfaces of insulators, there are
no corresponding indexes for Weyl semimetals whose nodal points may appear
randomly in the bulk Brillouin Zone (BZ). Here we use a well-known result that
every Weyl point acts as a Dirac monopole and generates integer Berry flux to
search for the monopoles on rectangular BZ grids that are commonly employed in
self-consistent electronic structure calculations. The method resembles data
mining technology of computer science and is demonstrated on locating the Weyl
points in known Weyl semimetals. It is subsequently used in high throughput
screening several hundreds of compounds and predicting a dozen new materials
hosting nodal Weyl points and/or lines.
