In order to test ISO 15022 settlement messaging with DTCC, you must have a Bank Identifier Code (BIC). For information on registering a BIC, see the BIC Policy document, published by SWIFT and available on the SWIFT web site.
The following excerpt from the document provides a description of its contents:
"This document provides a general description of the rules related to the registration and publication of BICs. It also provides guidelines for the use of BICs as identifiers and addresses within the SWIFT messaging service."
To register for or find a BIC, see SWIFT's BIC information page.