ETSI TS 101 231 specifies a register of Country and Network Identification (CNI), Video Programming System (VPS) codes and Application codes for Teletext based systems.
TS 101 231 points to data in the register being published on the ETSI Portal, on the present page. This register was previously maintained by the EBU on their website. The register is published as a PDF file.
Download the latest version of the register. (Update: 13 April 2021).
To request a new CNI code, please contact CTI_Support@etsi.org.