NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 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 | — |
| 2016-12-23 | 581-405 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | La Guadeloupe | — |
| 2016-12-09 | 581-805 | not yet reported which blocks → | Iristel Inc. | 154E | Rimouski | — |
| 2016-12-09 | 581-806 | not yet reported which blocks → | Iristel Inc. | 154E | Saint-Henri-de-Levis | — |
| 2016-12-09 | 581-807 | not yet reported which blocks → | Iristel Inc. | 154E | Montmagny | — |
| 2016-12-09 | 581-880 | not yet reported which blocks → | Iristel Inc. | 154E | Gaspe | — |
| 2016-10-27 | 581-501 | not yet reported which blocks → | Iristel Inc. | 154E | Levis | — |
| 2016-10-19 | 581-572 | not yet reported which blocks → | TELUS Mobility | 8303 | Tadoussac | — |
| 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 | — |
| 2016-09-23 | 581-774 | not yet reported which blocks → | Cooptel | 818D | Saint-Camille | — |
| 2016-08-25 | 581-478 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Dolbeau | — |
| 2016-08-01 | 581-475 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chicoutimi | — |
| 2016-08-01 | 581-476 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Alma | — |
| 2016-07-26 | 581-371 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Malachie | — |
| 2016-07-13 | 581-573 | not yet reported which blocks → | TELUS Mobility | 8303 | Lac-Etchemin | — |
| 2016-06-22 | 581-477 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Levis | — |
| 2016-05-25 | 581-536 | not yet reported which blocks → | Comwave Networks | 160G | Roberval | — |
| 2016-05-25 | 581-750 | not yet reported which blocks → | Comwave Networks | 160G | Biencourt | — |
| 2016-05-25 | 581-751 | not yet reported which blocks → | Comwave Networks | 160G | La Pocatiere | — |
| 2016-05-25 | 581-752 | not yet reported which blocks → | Comwave Networks | 160G | Trois-Pistoles | — |
| 2016-05-19 | 581-219 | not yet reported which blocks → | TELUS Quebec | 2243 | Valcartier | — |
| 2016-03-07 | 581-803 | not yet reported which blocks → | Iristel Inc. | 154E | St-Felicien | — |
| 2016-03-07 | 581-804 | not yet reported which blocks → | Iristel Inc. | 154E | St-Tite-des-Caps | — |
| 2016-02-19 | 581-812 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2016-02-18 | 581-802 | not yet reported which blocks → | Iristel Inc. | 154E | Thetford Mines | — |
| 2016-02-03 | 581-481 | not yet reported which blocks → | Iristel Inc. | 154E | Chibougamau | — |
| 2016-01-28 | 581-447 | not yet reported which blocks → | Bell Mobility | 6574 | Chicoutimi | — |
| 2016-01-21 | 581-205 | not yet reported which blocks → | Iristel Inc. | 154E | Alma | — |
| 2016-01-21 | 581-801 | not yet reported which blocks → | Iristel Inc. | 154E | Riviere-du-Loup | — |
| 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 | — |
| 2015-10-07 | 581-574 | not yet reported which blocks → | TELUS Mobility | 8303 | Chicoutimi | — |
| 2015-09-21 | 581-370 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Agathe-de-Lotbiniere | — |
| 2015-09-18 | 581-576 | not yet reported which blocks → | TELUS Mobility | 8303 | Saint-Flavien | — |
| 2015-09-18 | 581-577 | not yet reported which blocks → | TELUS Mobility | 8303 | Sainte-Anne-de-la-Perade | — |
| 2015-08-18 | 581-316 | not yet reported which blocks → | Distributel | 083E | Quebec | — |
| 2015-07-14 | 581-745 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.