Sorry for the late reply - I had to do some research on this one! The Common Industrial Protocol (CIP), previously known as Control and Information Protocol, is an industrial protocol for industrial automation applications. It is supported by ODVA and used by EtherNet/IP™, DeviceNet™, ControlNet™ and CompoNet™.
Official information on CIP can be found here: https://www.odva.org/Technology-Standards/Common-Industrial-Protocol-CIP/Overview
I hope this helps!