Splunk is a software that provides automated monitoring of NIST 800-53 controls to support continuous monitoring. It collects and indexes machine data from IT infrastructure in real time to gain insights. It can cross-reference data to specific NIST controls. Splunk scales to large data volumes and allows generating reports without a fixed schema. It also enables ad-hoc searching and forensic investigation across all IT data. The Splunk App for FISMA provides continuous monitoring of specific NIST controls for Windows and Unix/Linux systems to ease compliance.