456 NXX International Inbound Codes


This numbering resource is no longer administered in Canada. See status below.

456 NXX International Inbound Codes Description

The purpose of NPA 456 and its associated NXXs is to enable the routing of inbound international calls for carrier-specific services, particular to a service provider's network, to and between NANP Area countries. This is accomplished by providing carrier identification within the dialled digits of the E.164 number. More specifically, the prefix following 456 (456-NXX) identifies the carrier. Use of these numbers enables the proper routing of inbound international calls destined for these services.


456 NXX International Inbound Codes Assignment Guideline

456-NXX codes were assigned according to the Industry Numbering Committee (INC) International Inbound NPA Assignment Guideline, as accepted or modified by the Canadian Steering Committee on Numbering.

In 2017, the Industry Numbering Committee (INC) investigated the use of this resource in their networks and determined that there was no longer a need for the 456 NPA. INC agreed to sunset the ATIS-0300049, International Inbound NPA (INT/NPA/NXX) Assignment Guidelines and age the 456 NPA for five years before the NPA is returned to the general purpose code pool.

The Canadian Adjunct to International Inbound (INT/NPA/NXX) Reference Document can be obtained from the CRTC website by clicking here.


456 NXX International Inbound Codes Forms

Currently there are no 456-NXX assignments and no future assignments will be made.


456 NXX International Inbound Codes Status

Currently there are no 456-NXX assignments and no future assignments will be made.


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 www.cnac.ca Website Terms of Use may be found using the following links:
Privacy Policy      Website Terms of Use


Copyright ©1998-2024 Canadian Numbering Administration Consortium, Inc. (CNAC)