1. A method comprising: determining a first netlist and a second netlist; determining a list of the second netlist using each pin of the netlist as a key to a corresponding net for each pin; determining a pin in the first netlist, the pin associated with a first net name; by one or more computing devices, looking up the pin using the pin as a key in the list to determine a second net name for the pin; and by the one or more computing devices, determining if a crosslink exists between the first net name in the first netlist and the second net name in the second netlist.