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
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2014-06-06 | 581-457 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Simon-de-Rimouski | — |
| 2014-06-06 | 581-930 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Basile | — |
| 2014-04-04 | 581-986 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2014-01-29 | 581-650 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Honore (Temiscouata Co.) | — |
| 2013-11-01 | 581-312 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Come | — |
| 2013-10-08 | 581-300 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2013-10-08 | 581-450 | not yet reported which blocks → | Videotron Ltd. | 8306 | Loretteville | — |
| 2013-08-23 | 581-600 | not yet reported which blocks → | Videotron Ltd. | 8306 | Esprit-Saint | — |
| 2013-06-12 | 581-420 | not yet reported which blocks → | Videotron Ltd. | 8306 | Beauceville | — |
| 2013-02-08 | 581-985 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2013-01-09 | 581-648 | not yet reported which blocks → | Videotron Ltd. | 8306 | L'Ile-Verte | — |
| 2012-04-18 | 581-644 | not yet reported which blocks → | Videotron Ltd. | 8306 | Colombier | — |
| 2012-04-05 | 581-742 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2012-03-08 | 581-643 | not yet reported which blocks → | Videotron Ltd. | 8306 | Chute-aux-Outardes | — |
| 2012-03-07 | 581-327 | not yet reported which blocks → | Videotron Ltd. | 8306 | Tadoussac | — |
| 2012-02-27 | 581-642 | not yet reported which blocks → | Videotron Ltd. | 8306 | Baie-Comeau (Hauterive) | — |
| 2012-02-23 | 581-647 | not yet reported which blocks → | Videotron Ltd. | 8306 | Squatec | — |
| 2012-01-26 | 581-320 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sault-au-Mouton | — |
| 2012-01-26 | 581-322 | not yet reported which blocks → | Videotron Ltd. | 8306 | Les Escoumins | — |
| 2012-01-24 | 581-321 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sacre-Coeur | — |
| 2012-01-24 | 581-323 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Anne-de-Portneuf | — |
| 2012-01-24 | 581-324 | not yet reported which blocks → | Videotron Ltd. | 8306 | Bergeronnes | — |
| 2012-01-11 | 581-646 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Jean-de-Dieu | — |
| 2011-07-14 | 581-490 | not yet reported which blocks → | Videotron Ltd. | 328F | Chicoutimi | — |
| 2011-06-29 | 581-987 | not yet reported which blocks → | Videotron Ltd. | 328F | Baie-Comeau (Hauterive) | — |
| 2011-06-17 | 581-645 | not yet reported which blocks → | Videotron Ltd. | 8306 | Trois-Pistoles | — |
| 2011-06-01 | 581-560 | not yet reported which blocks → | Videotron Ltd. | 328F | Chicoutimi | — |
| 2011-03-24 | 581-223 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Bernard-de-Dorchester | — |
| 2011-03-24 | 581-227 | not yet reported which blocks → | Videotron Ltd. | 8306 | Frampton | — |
| 2011-03-24 | 581-229 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Patrice-de-Beaurivage | — |
| 2011-03-03 | 581-984 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2011-03-02 | 581-983 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2011-01-28 | 581-741 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2010-11-29 | 581-376 | not yet reported which blocks → | Videotron Ltd. | 8306 | Valcartier | — |
| 2010-10-15 | 581-982 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2010-07-29 | 581-640 | not yet reported which blocks → | Videotron Ltd. | 8306 | Petite-Riviere-St-Francois | — |
| 2010-07-29 | 581-641 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Urbain | — |
| 2010-03-26 | 581-456 | not yet reported which blocks → | Videotron Ltd. | 8306 | Rimouski | — |
| 2010-03-11 | 581-374 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Joseph-de-Beauce | — |
| 2010-02-18 | 581-375 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Marie-de-Beauce | — |
| 2010-02-02 | 581-740 | not yet reported which blocks → | Videotron Ltd. | 8306 | Donnacona | — |
| 2009-12-17 | 581-225 | not yet reported which blocks → | Videotron Ltd. | 8306 | Vallee-Jonction | — |
| 2009-12-17 | 581-226 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Joseph-de-Beauce | — |
| 2009-12-03 | 581-656 | not yet reported which blocks → | Videotron Ltd. | 8306 | Riviere-Bleue | — |
| 2009-11-26 | 581-421 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Eleuthere | — |
| 2009-10-21 | 581-981 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2009-09-29 | 581-649 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Georges-de-Beauce | — |
| 2009-04-21 | 581-224 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Marie-de-Beauce | — |
| 2008-09-18 | 581-679 | not yet reported which blocks → | Videotron Ltd. | 8306 | Black Lake | — |
| 2008-09-18 | 581-680 | not yet reported which blocks → | Videotron Ltd. | 8306 | Thetford Mines | — |
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.