The CBRN domain provides the primary source of data elements and attributes for the N.25 Information Exchange Package (IEP) as well as a source of standard components for other IEPs when there is a need for data components that have been defined in the CBRN domain.


CBRN is governed by the CBRN Domain Community of Interest (COI) and is currently under the stewardship of DHS Domestic Nuclear Detection Office (DNDO).  To support the need for information-sharing in the Preventive Rad/Nuc Detection mission area, DHS's DNDO, with the support and cooperation of Customs and Border Patrol (CBP), developed a standard messaging protocol for interoperability and information sharing among Global Nuclear Detection Architecture (GNDA) participants – the N.25 Protocol. During the development of the N.25 Protocol, the CBRN domain was established to publish a set of data elements and common Rad/Nuc vocabulary that did not already exist in the model. Subsequently, these domain elements were harmonized with the Maritime and International Trade domains.

Explore CBRN model content

CBRN Word Cloud
This word cloud shows the most commonly used CBRN domain elements in the NIEM data model

The CBRN domain and Information Exchange Package Documentation (IEPD) models are developed using the IEPD Factory software tool. Download the following resources to learn more about the CBRN domain and its associated content:

*Read the “ReadMe-v40.txt” file first. Two versions of each IEPD schema are provided: constrained and unconstrained.

The CBRN domain in action

Learn about the Southeast Transportation Corridor Pilot (SETCP) and explore CBRN Success Stories.

Get involved

For questions or to request domain membership, email NIEM CBRN Steward.