The original RFCs that specified the Remote Direct Data Placement (RDDP) protocol suite did not create IANA registries for RDDP error codes@ operation codes@ and function codes. Extensions to the RDDP protocols now require these registries to be created. This memo creates the RDDP registries@ populates them with values defined in the original RDDP RFCs@ and provides guidance to IANA for future assignment of code points within these registries.