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
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May 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2018-05-16 | 581-658 | not yet reported which blocks → | Videotron Ltd. | 8306 | Riviere-a-Pierre | — |
| 2018-05-16 | 581-659 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Adelphe | — |
| 2018-04-04 | 581-762 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Henri-de-Levis | — |
| 2018-02-28 | 581-763 | not yet reported which blocks → | Videotron Ltd. | 8306 | Disraeli | — |
| 2018-02-20 | 581-563 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Ubalde | — |
| 2018-01-18 | 581-491 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2017-10-17 | 581-562 | not yet reported which blocks → | Videotron Ltd. | 8306 | Rimouski | — |
| 2017-10-17 | 581-748 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2017-07-31 | 581-775 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Methode-de-Frontenac | — |
| 2017-07-31 | 581-776 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Magloire | — |
| 2017-05-08 | 581-653 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Georges-de-Beauce | — |
| 2017-03-01 | 581-764 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Just-de-Bretenieres | — |
| 2017-03-01 | 581-765 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lac-Etchemin | — |
| 2017-02-07 | 581-766 | not yet reported which blocks → | Videotron Ltd. | 8306 | East Broughton | — |
| 2017-02-07 | 581-767 | not yet reported which blocks → | Videotron Ltd. | 8306 | Inverness | — |
| 2017-02-07 | 581-768 | not yet reported which blocks → | Videotron Ltd. | 8306 | Leeds | — |
| 2017-02-07 | 581-769 | not yet reported which blocks → | Videotron Ltd. | 8306 | Stratford | — |
| 2017-02-06 | 581-746 | not yet reported which blocks → | Videotron Ltd. | 328F | Sainte-Marie-de-Beauce | — |
| 2017-02-03 | 581-744 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Georges-de-Beauce | — |
| 2017-02-03 | 581-747 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Joseph-de-Beauce | — |
| 2017-01-30 | 581-675 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Marc-des-Carrieres | — |
| 2017-01-30 | 581-677 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Simon-de-Rimouski | — |
| 2017-01-30 | 581-678 | not yet reported which blocks → | Videotron Ltd. | 328F | Thetford Mines | — |
| 2017-01-27 | 581-676 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Roch-des-Aulnaies | — |
| 2017-01-25 | 581-671 | not yet reported which blocks → | Videotron Ltd. | 328F | Montmagny | — |
| 2017-01-25 | 581-672 | not yet reported which blocks → | Videotron Ltd. | 328F | Rimouski | — |
| 2017-01-25 | 581-673 | not yet reported which blocks → | Videotron Ltd. | 328F | Riviere-du-Loup | — |
| 2017-01-25 | 581-674 | not yet reported which blocks → | Videotron Ltd. | 328F | Roberval | — |
| 2017-01-19 | 581-667 | not yet reported which blocks → | Videotron Ltd. | 328F | Alma | — |
| 2017-01-19 | 581-668 | not yet reported which blocks → | Videotron Ltd. | 328F | Chicoutimi | — |
| 2017-01-19 | 581-669 | not yet reported which blocks → | Videotron Ltd. | 328F | Donnacona | — |
| 2017-01-19 | 581-670 | not yet reported which blocks → | Videotron Ltd. | 328F | La Malbaie | — |
| 2017-01-05 | 581-652 | not yet reported which blocks → | Videotron Ltd. | 8306 | Baie-Ste-Catherine | — |
| 2016-09-23 | 581-770 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Rose | — |
| 2016-09-23 | 581-771 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Justine | — |
| 2016-09-23 | 581-772 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Odilon | — |
| 2016-09-23 | 581-773 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Zacharie | — |
| 2016-07-26 | 581-371 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Malachie | — |
| 2015-12-22 | 581-561 | not yet reported which blocks → | Videotron Ltd. | 8306 | Metabetchouan | — |
| 2015-10-19 | 581-988 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2015-09-21 | 581-370 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Agathe-de-Lotbiniere | — |
| 2015-07-14 | 581-745 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2014-11-07 | 581-315 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Prosper-de-Dorchester | — |
| 2014-10-09 | 581-664 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Roch-des-Aulnaies | — |
| 2014-10-09 | 581-665 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Simon-de-Rimouski | — |
| 2014-10-03 | 581-651 | not yet reported which blocks → | Videotron Ltd. | 8306 | Girardville | — |
| 2014-08-29 | 581-373 | not yet reported which blocks → | Videotron Ltd. | 8306 | Biencourt | — |
| 2014-07-17 | 581-314 | not yet reported which blocks → | Videotron Ltd. | 328F | Rimouski | — |
| 2014-06-17 | 581-328 | not yet reported which blocks → | Videotron Ltd. | 8306 | Armagh | — |
| 2014-06-17 | 581-332 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Paul-de-Montminy | — |
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.