CNA Logo


CO Code Guideline

Click here to access the CO Code status information by Area Code.

Jeopardy Contingency Plan

The following NPA(s) are currently in a Jeopardy Condition. When an NPA is in Jeopardy, a Jeopardy Contingency Plan is put into effect for that NPA and must be followed. Jeopardy Contingency Plans for the NPAs can be accessed on their respective Relief Planning pages which can be accessed at the links below:
  • There are currently no NPAs in a Jeopardy Condition

CO Code Assignment Guideline

The current CRTC-approved Canadian Central Office Code (NXX) Assignment Guideline is available below.  It is available as MS Word documents:

Central Office Code (NXX) Assignment
Request and Confirmation Forms

The CO Code Assignment, Reservation, Information Change & Return (Part 1); Routing and Rating Information (Part 2); and In Service (Part 4) forms are part of the Canadian Central Office Code (NXX) Assignment Guideline, which is located in parts on the CRTC website.

Those meeting all the requirements to submit forms related to CO Codes can find direct links to the forms below for submission to the Code Administrator and submit them to

Part 2

During CSCN 60, agreement was reached that iconectiv Telecom Routing Administration (TRA) Part 2 Forms, as developed and amended from time to time by TRA, can be used by Canadian CO Code Holders to facilitate data entry into the TRA database.  The CNA is not required to provide Part 2 Forms of any vintage to any party.

A Job Aid to assist Code Applicants in completing the Part 2 Form may be obtained from TRA by calling 732-699-6700, by facsimile at 732-336-6999, or by internet website at

The role of the Canadian Numbering Administrator (CNA) is being performed by COMsolve Inc. under contract with Canadian Numbering Administration Consortium Inc. (CNAC). The CNAC Privacy Policy and the Website Terms of Use may be found using the following links:
Privacy Policy      Website Terms of Use

Copyright 1998-2021 Canadian Numbering Administration Consortium, Inc. (CNAC)

Canadian Flag