NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
Most active assignees, all time — NPA 581
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2021-03-02 | 581-867 | not yet reported which blocks → | TELUS Quebec | 8083 | Amqui | — |
| 2021-03-02 | 581-913 | not yet reported which blocks → | TELUS Quebec | 8083 | Chandler | — |
| 2021-03-02 | 581-917 | not yet reported which blocks → | TELUS Quebec | 8083 | Grande-Riviere | — |
| 2021-03-02 | 581-918 | not yet reported which blocks → | TELUS Quebec | 8083 | Chute-aux-Outardes | — |
| 2021-03-02 | 581-919 | not yet reported which blocks → | TELUS Quebec | 8083 | Baie-Comeau | — |
| 2021-03-02 | 581-921 | not yet reported which blocks → | TELUS Quebec | 8083 | Causapscal | — |
| 2021-03-01 | 581-914 | not yet reported which blocks → | TELUS Quebec | 8083 | Riviere-au-Renard | — |
| 2021-03-01 | 581-915 | not yet reported which blocks → | TELUS Quebec | 8083 | Sainte-Anne-des-Monts | — |
| 2021-03-01 | 581-916 | not yet reported which blocks → | TELUS Quebec | 8083 | Forestville | — |
| 2021-02-25 | 581-446 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2021-02-10 | 581-923 | not yet reported which blocks → | TELUS Quebec | 8083 | New Carlisle | — |
| 2021-02-10 | 581-924 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Tite | — |
| 2021-02-09 | 581-952 | not yet reported which blocks → | TELUS Quebec | 8083 | Pont-Rouge | — |
| 2021-02-08 | 581-926 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Stanislas | — |
| 2021-02-08 | 581-948 | not yet reported which blocks → | TELUS Quebec | 8083 | Carleton | — |
| 2021-02-08 | 581-949 | not yet reported which blocks → | TELUS Quebec | 8083 | New Richmond | — |
| 2021-02-08 | 581-951 | not yet reported which blocks → | TELUS Quebec | 8083 | Pointe-a-la-Croix | — |
| 2021-02-08 | 581-953 | not yet reported which blocks → | TELUS Quebec | 8083 | Portneuf | — |
| 2021-02-08 | 581-954 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Augustin | — |
| 2021-02-08 | 581-956 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Marc-des-Carrieres | — |
| 2021-02-08 | 581-957 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Raymond | — |
| 2021-01-26 | 581-974 | not yet reported which blocks → | SSi Micro Ltd. | 940G | Chibougamau | — |
| 2020-12-18 | 581-912 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2020-11-17 | 581-908 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lambton | — |
| 2020-10-19 | 581-947 | not yet reported which blocks → | TELUS Quebec | 2243 | Cap-aux-Meules | — |
| 2020-09-22 | 581-202 | not yet reported which blocks → | Iristel Inc. | 154E | Alma | — |
| 2020-09-14 | 581-892 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2020-08-17 | 581-615 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Boischatel | — |
| 2020-08-17 | 581-616 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Loretteville | — |
| 2020-08-17 | 581-617 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Notre-Dame-des-Laurentides | — |
| 2020-08-17 | 581-618 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Fereol | — |
| 2020-08-17 | 581-619 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Anne-de-Beaupre | — |
| 2020-08-11 | 581-973 | not yet reported which blocks → | SSi Micro Ltd. | 940G | Mistissini | — |
| 2020-08-10 | 581-972 | not yet reported which blocks → | SSi Micro Ltd. | 940G | Chapais | — |
| 2020-07-23 | 581-206 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Stoneham | — |
| 2020-07-23 | 581-207 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Valcartier | — |
| 2020-06-23 | 581-662 | not yet reported which blocks → | Fibernetics Corporation | 464D | Loretteville | — |
| 2020-06-23 | 581-663 | not yet reported which blocks → | Fibernetics Corporation | 464D | Notre-Dame-des-Laurentides | — |
| 2020-06-23 | 581-666 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Catherine | — |
| 2020-06-04 | 581-945 | not yet reported which blocks → | TELUS Quebec | 2243 | Lambton | — |
| 2020-06-04 | 581-946 | not yet reported which blocks → | TELUS Quebec | 2243 | Courcelles | — |
| 2020-02-13 | 581-466 | not yet reported which blocks → | Bell Mobility | 6574 | Riviere-du-Loup | — |
| 2020-01-30 | 581-441 | not yet reported which blocks → | Iristel Inc. | 154E | Bonaventure | — |
| 2020-01-30 | 581-499 | not yet reported which blocks → | Iristel Inc. | 154E | Carleton | — |
| 2020-01-30 | 581-870 | not yet reported which blocks → | Iristel Inc. | 154E | Thetford Mines | — |
| 2020-01-30 | 581-900 | not yet reported which blocks → | Iristel Inc. | 154E | Baie-Trinite | — |
| 2020-01-17 | 581-890 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2020-01-17 | 581-891 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2019-12-03 | 581-443 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2019-10-29 | 581-470 | not yet reported which blocks → | Iristel Inc. | 346J | Bonaventure | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.