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 |
|---|---|---|---|---|---|---|
| 2020-11-17 | 581-908 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lambton | — |
| 2019-10-10 | 581-909 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-10-07 | 581-978 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-09-13 | 581-455 | not yet reported which blocks → | Videotron Ltd. | 8306 | La Guadeloupe | — |
| 2019-09-13 | 581-458 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Methode-de-Frontenac | — |
| 2019-09-12 | 581-454 | not yet reported which blocks → | Videotron Ltd. | 8306 | Disraeli | — |
| 2019-07-25 | 581-910 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-05-21 | 581-864 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Gedeon-de-Beauce | — |
| 2019-02-21 | 581-944 | not yet reported which blocks → | Videotron Ltd. | 8306 | East Broughton | — |
| 2019-02-21 | 581-979 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-02-20 | 581-940 | not yet reported which blocks → | Videotron Ltd. | 8306 | Leeds | — |
| 2019-02-20 | 581-941 | not yet reported which blocks → | Videotron Ltd. | 8306 | Inverness | — |
| 2019-02-20 | 581-943 | not yet reported which blocks → | Videotron Ltd. | 8306 | Stratford | — |
| 2018-12-20 | 581-937 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Magloire | — |
| 2018-12-20 | 581-938 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Odilon | — |
| 2018-12-20 | 581-939 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Zacharie | — |
| 2018-12-19 | 581-931 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Malachie | — |
| 2018-12-19 | 581-932 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lac-Etchemin | — |
| 2018-12-19 | 581-933 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Camille | — |
| 2018-12-19 | 581-934 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Justine | — |
| 2018-12-19 | 581-935 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Rose | — |
| 2018-12-19 | 581-936 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Just-de-Bretenieres | — |
| 2018-12-11 | 581-980 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2018-11-14 | 581-863 | not yet reported which blocks → | Videotron Ltd. | 8306 | Chateau-Richer | — |
| 2018-11-09 | 581-448 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Prosper-de-Dorchester | — |
| 2018-11-08 | 581-449 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Come | — |
| 2018-11-05 | 581-451 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Marie-de-Beauce | — |
| 2018-11-05 | 581-452 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Georges-de-Beauce | — |
| 2018-10-29 | 581-849 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2018-10-01 | 581-862 | not yet reported which blocks → | Videotron Ltd. | 8306 | Baie-Comeau (Hauterive) | — |
| 2018-09-25 | 581-860 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Bernard-de-Dorchester | — |
| 2018-09-25 | 581-861 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Patrice-de-Beaurivage | — |
| 2018-09-24 | 581-859 | not yet reported which blocks → | Videotron Ltd. | 8306 | Vallee-Jonction | — |
| 2018-09-20 | 581-856 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Agathe-de-Lotbiniere | — |
| 2018-09-20 | 581-857 | not yet reported which blocks → | Videotron Ltd. | 8306 | Frampton | — |
| 2018-09-20 | 581-858 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Joseph-de-Beauce | — |
| 2018-09-10 | 581-855 | not yet reported which blocks → | Videotron Ltd. | 8306 | Montmagny | — |
| 2018-09-06 | 581-854 | not yet reported which blocks → | Videotron Ltd. | 8306 | Thetford Mines | — |
| 2018-08-24 | 581-851 | not yet reported which blocks → | Videotron Ltd. | 8306 | Alma | — |
| 2018-08-24 | 581-852 | not yet reported which blocks → | Videotron Ltd. | 8306 | Beauceville | — |
| 2018-08-24 | 581-853 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lac-aux-Sables | — |
| 2018-08-17 | 581-850 | not yet reported which blocks → | Videotron Ltd. | 8306 | La Malbaie | — |
| 2018-08-16 | 581-660 | not yet reported which blocks → | Videotron Ltd. | 8306 | Rimouski | — |
| 2018-08-02 | 581-419 | not yet reported which blocks → | Videotron Ltd. | 8306 | Donnacona | — |
| 2018-07-23 | 581-558 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Thecle | — |
| 2018-06-28 | 581-749 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Henri-de-Levis | — |
| 2018-06-07 | 581-743 | not yet reported which blocks → | Videotron Ltd. | 8306 | Riviere-du-Loup | — |
| 2018-05-29 | 581-655 | not yet reported which blocks → | Videotron Ltd. | 8306 | Levis | — |
| 2018-05-28 | 581-654 | not yet reported which blocks → | Videotron Ltd. | 8306 | Chicoutimi | — |
| 2018-05-16 | 581-657 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Casimir | — |
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.