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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2018-02-20 | 581-563 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Ubalde | — |
| 2018-02-01 | 581-453 | not yet reported which blocks → | Bell Mobility | 6574 | Havre-Aubert | — |
| 2018-01-24 | 581-992 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2018-01-23 | 581-688 | not yet reported which blocks → | Fido Solutions Inc. | 5643 | Quebec | — |
| 2018-01-18 | 581-491 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2017-12-04 | 581-510 | not yet reported which blocks → | Sogetel Inc. | 8237 | Beauceville | — |
| 2017-11-16 | 581-220 | not yet reported which blocks → | TELUS Quebec | 2243 | Ville Degelis | — |
| 2017-11-06 | 581-661 | not yet reported which blocks → | Bell Mobility | 6574 | Chandler | — |
| 2017-10-25 | 581-397 | not yet reported which blocks → | Bell Mobility | 6574 | 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 | — |
| 2017-10-06 | 581-502 | not yet reported which blocks → | Iristel Inc. | 154E | Levis | — |
| 2017-10-04 | 581-204 | not yet reported which blocks → | Iristel Inc. | 154E | Alma | — |
| 2017-10-04 | 581-707 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2017-10-04 | 581-708 | not yet reported which blocks → | Iristel Inc. | 154E | Chicoutimi | — |
| 2017-10-04 | 581-808 | not yet reported which blocks → | Iristel Inc. | 154E | St-Tite-des-Caps | — |
| 2017-09-28 | 581-553 | not yet reported which blocks → | TELUS Quebec | 8083 | Sainte-Marie-de-Beauce | — |
| 2017-09-28 | 581-993 | not yet reported which blocks → | TELUS Mobility | 8303 | 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 | — |
| 2017-07-26 | 581-800 | not yet reported which blocks → | Iristel Inc. | 154E | St-Felicien | — |
| 2017-06-14 | 581-473 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Felicien | — |
| 2017-05-25 | 581-706 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2017-05-19 | 581-368 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Alexis-de-Matapedia | — |
| 2017-05-19 | 581-369 | not yet reported which blocks → | TELUS Quebec | 8083 | Matapedia | — |
| 2017-05-08 | 581-653 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Georges-de-Beauce | — |
| 2017-04-05 | 581-866 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Loretteville | — |
| 2017-04-05 | 581-868 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Levis | — |
| 2017-04-05 | 581-869 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Chicoutimi | — |
| 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 | — |
| 2017-02-15 | 581-603 | not yet reported which blocks → | Bell Canada | 8050 | Thetford Mines | — |
| 2017-02-15 | 581-604 | not yet reported which blocks → | Bell Canada | 8050 | Levis | — |
| 2017-02-15 | 581-605 | not yet reported which blocks → | Bell Canada | 8050 | Quebec | — |
| 2017-02-15 | 581-606 | not yet reported which blocks → | Bell Canada | 8050 | La Malbaie | — |
| 2017-02-15 | 581-607 | not yet reported which blocks → | Bell Canada | 8050 | Chicoutimi | — |
| 2017-02-15 | 581-608 | not yet reported which blocks → | Bell Canada | 8050 | Alma | — |
| 2017-02-15 | 581-609 | not yet reported which blocks → | Bell Canada | 8050 | Riviere-du-Loup | — |
| 2017-02-15 | 581-612 | not yet reported which blocks → | Bell Canada | 8050 | Quebec | — |
| 2017-02-14 | 581-613 | not yet reported which blocks → | Bell Canada | 8050 | Quebec | — |
| 2017-02-09 | 581-479 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chibougamau | — |
| 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 | — |
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.