CO Thousands-Block Status
CO Thousands-Block status data is published to the www.cnac.ca website from the CNAS master database every night from Monday through Friday.
CO Thousands-Block status data is provided here to assist carriers in determining which blocks are available for applications and also for
the general public to know where assigned blocks are located. Networking and routing information can be found in the LERG™ Routing Guide (LERG)
(see Commission Letters 8698-C12-08/00 and 8698-C12-14/01)
Interim Measures to Limit the Assignment of CO Codes (2023-10-30)
The CNA has received direction via a CRTC Secretary General letter to immediately implement interim measures of limiting
the assignment of geographic CO Codes. The following excerpt is from the direction:
"...the Commission directs, effective immediately, the implementation of an interim measure requiring the CNA to limit the assignment of geographic CO codes to the July 2023 round of Numbering Resource Utilization Forecast (NRUF) on a yearly, per carrier, and per Numbering Plan Area (NPA) complex basis, for all carriers, and 80% of the forecasts for any carrier who has forecasted more than 20 codes for any given year and NPA complex. Under this measure, carriers will still be able to obtain telephone numbers to grow their business as the forecast covers the period from 2023 to 2029. However, if a carrier requests CO codes beyond those levels, it will have to apply to both the CNA and the Commission, justifying why additional resources are required."
"...the Commission directs, effective immediately, the implementation of an interim measure requiring the CNA to limit the assignment of geographic CO codes to the July 2023 round of Numbering Resource Utilization Forecast (NRUF) on a yearly, per carrier, and per Numbering Plan Area (NPA) complex basis, for all carriers, and 80% of the forecasts for any carrier who has forecasted more than 20 codes for any given year and NPA complex. Under this measure, carriers will still be able to obtain telephone numbers to grow their business as the forecast covers the period from 2023 to 2029. However, if a carrier requests CO codes beyond those levels, it will have to apply to both the CNA and the Commission, justifying why additional resources are required."
- CRTC Secretary General letter to the CNA (dated 2023-10-30)
- CNA Letter to CRTC Secretary General with implementation assumptions (dated 2023-11-08)
- CRTC staff letter concurring with CNA implementation assumptions (dated 2023-11-15)
- CNA Letter to CRTC Secretary General with additional assumptions related to NRUFs and Block conversion (dated 2025-04-11)
Thousand-Block Pooling Production Testing
The CNA will start accepting Thousands-Block Pooling applications (Part 1a + Part 1b) for Thousands Blocks for TPB testing as of Wednesday, 4 June 2025.
Before applying to the CNA, applicants should ensure the following:
Canadian Production Testing for Thousands-Block Pooling is taking place from 1 April 2025 until 6 October 2025 when TBP must be implemented. The following correspondence with the CRTC supports testing during this period and allows for Industry Notification timeframes to be expedited:
- Their LSMS or source provider for LNP dips has been certified and is ready to show Thousands-Block records; and,
- Thousands Blocks in the pool, in which they intend to apply, are marked as Available (AV) in the status pages for TBP Testing purposes. (see below for TBP Status definitions)
Canadian Production Testing for Thousands-Block Pooling is taking place from 1 April 2025 until 6 October 2025 when TBP must be implemented. The following correspondence with the CRTC supports testing during this period and allows for Industry Notification timeframes to be expedited:
- Carrier Checklist for Thousands Block Pooling(dated 2025-07-03)
- CRTC Staff approval response for blanket Expedited Industry Notification permission for testing(dated 2025-05-07)
- CNA Letter to CRTC Staff requesting blanket Expedited Industry Notification permission for testing(dated 2025-03-06)
- CRTC staff letter to CSCN supporting CO Codes for TBP testing(posted 2024-12-18)
- Letter from CSCN to CRTC Recommending CO Codes for TBP Testing(dated 2024-12-06)
Access the CO Thousands-Block (NXX-X) status data for a specific NPA by selecting the its associated NPA Complex link below.
The data is available in both a friendly
HTML Format and in CSV Files below the map.
(You may find a higher resolution NPA map in the Area Code Maps section)
HTML (CSV) Format
Complex 1 - 204/431/584 Manitoba(csv)
Complex 2 - 226/382/519/548 Southwestern Ontario(csv)
Complex 3 - 236/250/257/604/672/778 British Columbia(csv)
Complex 4 - 249/683/705 North-Central Ontario(csv)
Complex 5 - 289/365/742/905 Southern Ontario(csv)
Complex 6 - 306/474/639 Saskatchewan(csv)
Complex 7 - 343/613/753 Eastern Ontario(csv)
Complex 8 - 354/450/579 Suburban Montréal Area(csv)
Complex 9 - 367/418/581 Eastern Québec(csv)
Complex 10 - 368/403/587/780/825 Alberta(csv)
Complex 11 - 416/437/647/942 Metro Toronto(csv)
Complex 12 - 428/506 New Brunswick(csv)
Complex 13 - 263/438/514 Metro Montréal(csv)
Complex 14 - 709/879 Newfoundland and Labrador(csv)
Complex 15 - 782/902 Nova Scotia and Prince Edward Island(csv)
Complex 16 - 807 Northwestern Ontario(csv)
Complex 17 - 468/819/873 Northern and Western Québec(csv)
Complex 18 - 867 Northwest Territories, Nunavut, and Yukon(csv)
The CO Block status for all NPA Complexes are available in this compressed CSV file (requires a ZIP decompression utility).
Thousand-Block Pooling Block Status Codes
| Code | Block Status | Status description |
|---|---|---|
| AV | Available | A thousands-block that is available for assignment |
| AF | Available (Future) | A thousands-block that is available for assignment, however it has a future effective date |
| AP | Available (Pending) | A thousands-block that is available for assignment; however, it is pending verification of activation in the PSTN by the code holder |
| AS | Assigned | A thousands-block that the CNA has assigned to a service provider |
| RT | Retained | A thousands-block that was not assigned by the CNA where the block was donated to the pool (may not be used in Canada) |
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 ©1998-2025 Canadian Numbering Administration Consortium, Inc. (CNAC)
