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
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 |
|---|---|---|---|---|---|---|
| 2011-09-12 | 581-238 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Bergeronnes | — |
| 2011-09-12 | 581-239 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Clermont | — |
| 2011-09-12 | 581-240 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Ile-aux-Coudres | — |
| 2011-09-12 | 581-241 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | La Malbaie | — |
| 2011-09-12 | 581-242 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Les Eboulements | — |
| 2011-09-12 | 581-243 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Les Escoumins | — |
| 2011-09-12 | 581-244 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Petite-Riviere-St-Francois | — |
| 2011-08-05 | 581-700 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2011-08-05 | 581-701 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2011-07-28 | 581-777 | not yet reported which blocks → | Fido Solutions Inc. | 5643 | Quebec | — |
| 2011-07-21 | 581-232 | not yet reported which blocks → | TELUS Mobility | 8303 | Matane | — |
| 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 | — |
| 2011-06-07 | 581-317 | not yet reported which blocks → | Distributel | 083E | Quebec | — |
| 2011-06-07 | 581-318 | not yet reported which blocks → | Distributel | 083E | Quebec | — |
| 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 | — |
| 2011-03-18 | 581-235 | not yet reported which blocks → | TELUS Mobility | 8303 | Chicoutimi | — |
| 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 | — |
| 2011-02-24 | 581-359 | not yet reported which blocks → | TELUS Quebec | 8083 | Grande-Riviere | — |
| 2011-02-24 | 581-360 | not yet reported which blocks → | TELUS Quebec | 8083 | Gaspe | — |
| 2011-02-24 | 581-361 | not yet reported which blocks → | TELUS Quebec | 8083 | Chandler | — |
| 2011-02-24 | 581-362 | not yet reported which blocks → | TELUS Quebec | 8083 | Carleton | — |
| 2011-02-24 | 581-363 | not yet reported which blocks → | TELUS Quebec | 8083 | Caplan | — |
| 2011-02-24 | 581-364 | not yet reported which blocks → | TELUS Quebec | 8083 | Bonaventure | — |
| 2011-02-24 | 581-365 | not yet reported which blocks → | TELUS Quebec | 8083 | Barachois | — |
| 2011-02-23 | 581-351 | not yet reported which blocks → | TELUS Quebec | 8083 | Port-Daniel | — |
| 2011-02-23 | 581-352 | not yet reported which blocks → | TELUS Quebec | 8083 | Pointe-a-la-Croix | — |
| 2011-02-23 | 581-353 | not yet reported which blocks → | TELUS Quebec | 8083 | Perce | — |
| 2011-02-23 | 581-354 | not yet reported which blocks → | TELUS Quebec | 8083 | Nouvelle | — |
| 2011-02-23 | 581-355 | not yet reported which blocks → | TELUS Quebec | 8083 | New Richmond | — |
| 2011-02-23 | 581-356 | not yet reported which blocks → | TELUS Quebec | 8083 | Newport | — |
| 2011-02-23 | 581-357 | not yet reported which blocks → | TELUS Quebec | 8083 | New Carlisle | — |
| 2011-02-23 | 581-358 | not yet reported which blocks → | TELUS Quebec | 8083 | Maria | — |
| 2011-02-02 | 581-308 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2011-01-28 | 581-741 | not yet reported which blocks → | Videotron Ltd. | 8306 | Quebec | — |
| 2010-12-06 | 581-883 | not yet reported which blocks → | TELUS Mobility | 8303 | Grande-Vallee | — |
| 2010-12-01 | 581-623 | not yet reported which blocks → | TELUS Mobility | 8303 | Forestville | — |
| 2010-11-29 | 581-376 | not yet reported which blocks → | Videotron Ltd. | 8306 | Valcartier | — |
| 2010-11-16 | 581-991 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2010-10-15 | 581-982 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2010-10-15 | 581-994 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2010-10-15 | 581-995 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2010-10-15 | 581-996 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2010-09-28 | 581-887 | not yet reported which blocks → | TELUS Mobility | 8303 | Gaspe | — |
| 2010-09-10 | 581-222 | not yet reported which blocks → | Iristel Inc. | 154E | Chicoutimi | — |
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.