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
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Dec 2025
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2015-02-18 | 581-543 | not yet reported which blocks → | TELUS Quebec | 2243 | Chicoutimi | — |
| 2015-02-18 | 581-544 | not yet reported which blocks → | TELUS Quebec | 2243 | Jonquiere | — |
| 2015-02-18 | 581-545 | not yet reported which blocks → | TELUS Quebec | 2243 | La Baie (Chicoutimi Co.) | — |
| 2015-02-18 | 581-546 | not yet reported which blocks → | TELUS Quebec | 2243 | Laterriere | — |
| 2015-02-18 | 581-547 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Honore (Chicoutimi Co.) | — |
| 2014-12-31 | 581-636 | not yet reported which blocks → | TELUS Quebec | 8083 | Riviere-au-Renard | — |
| 2014-12-31 | 581-637 | not yet reported which blocks → | TELUS Quebec | 8083 | Cloridorme | — |
| 2014-12-31 | 581-638 | not yet reported which blocks → | TELUS Quebec | 8083 | Grande-Vallee | — |
| 2014-12-31 | 581-639 | not yet reported which blocks → | TELUS Quebec | 8083 | Murdochville | — |
| 2014-12-24 | 581-635 | not yet reported which blocks → | TELUS Quebec | 8083 | Cap-des-Rosiers | — |
| 2014-12-22 | 581-538 | not yet reported which blocks → | TELUS Quebec | 2243 | Boischatel | — |
| 2014-12-22 | 581-539 | not yet reported which blocks → | TELUS Quebec | 2243 | Notre-Dame-des-Laurentides | — |
| 2014-12-22 | 581-540 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Anne-de-Beaupre | — |
| 2014-12-22 | 581-541 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Brigitte-de-Laval | — |
| 2014-12-22 | 581-542 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Catherine | — |
| 2014-07-28 | 581-212 | not yet reported which blocks → | TELUS Quebec | 2243 | Dolbeau | — |
| 2014-07-28 | 581-217 | not yet reported which blocks → | TELUS Quebec | 2243 | Roberval | — |
| 2014-07-28 | 581-218 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Felicien | — |
| 2014-07-23 | 581-627 | not yet reported which blocks → | TELUS Quebec | 2243 | Chibougamau | — |
| 2014-07-17 | 581-216 | not yet reported which blocks → | TELUS Quebec | 2243 | Alma | — |
| 2014-05-27 | 581-213 | not yet reported which blocks → | TELUS Quebec | 2243 | La Pocatiere | — |
| 2014-05-27 | 581-214 | not yet reported which blocks → | TELUS Quebec | 2243 | Riviere-du-Loup | — |
| 2014-03-26 | 581-634 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Methode-de-Frontenac | — |
| 2014-03-07 | 581-835 | not yet reported which blocks → | TELUS Quebec | 2243 | Garthby | — |
| 2014-03-07 | 581-840 | not yet reported which blocks → | TELUS Quebec | 2243 | Black Lake | — |
| 2013-09-25 | 581-836 | not yet reported which blocks → | TELUS Quebec | 2243 | Loretteville | — |
| 2013-09-25 | 581-837 | not yet reported which blocks → | TELUS Quebec | 2243 | Stoneham | — |
| 2013-09-25 | 581-838 | not yet reported which blocks → | TELUS Quebec | 2243 | Charny | — |
| 2013-09-25 | 581-839 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Nicolas | — |
| 2013-09-24 | 581-833 | not yet reported which blocks → | TELUS Quebec | 8083 | Donnacona | — |
| 2013-09-24 | 581-834 | not yet reported which blocks → | TELUS Quebec | 8083 | Matane | — |
| 2013-09-17 | 581-628 | not yet reported which blocks → | TELUS Quebec | 2243 | Quebec | — |
| 2013-09-17 | 581-630 | not yet reported which blocks → | TELUS Quebec | 8083 | Bonaventure | — |
| 2013-09-17 | 581-631 | not yet reported which blocks → | TELUS Quebec | 8083 | Matane | — |
| 2013-09-17 | 581-632 | not yet reported which blocks → | TELUS Quebec | 8083 | Montmagny | — |
| 2013-09-17 | 581-633 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Henri-de-Levis | — |
| 2013-07-19 | 581-629 | not yet reported which blocks → | TELUS Quebec | 2243 | Levis | — |
| 2013-07-17 | 581-829 | not yet reported which blocks → | TELUS Quebec | 8083 | Baie-Comeau (Hauterive) | — |
| 2013-07-17 | 581-831 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Georges-de-Beauce | — |
| 2013-07-11 | 581-827 | not yet reported which blocks → | TELUS Quebec | 8083 | Bonaventure | — |
| 2013-07-11 | 581-830 | not yet reported which blocks → | TELUS Quebec | 8083 | Sept-Iles | — |
| 2013-07-11 | 581-832 | not yet reported which blocks → | TELUS Quebec | 8083 | Gaspe | — |
| 2013-07-05 | 581-828 | not yet reported which blocks → | TELUS Quebec | 2243 | Alma | — |
| 2013-06-14 | 581-720 | not yet reported which blocks → | TELUS Quebec | 8083 | Rimouski | — |
| 2013-04-26 | 581-821 | not yet reported which blocks → | TELUS Quebec | 8083 | Donnacona | — |
| 2013-04-26 | 581-822 | not yet reported which blocks → | TELUS Quebec | 8083 | Gaspe | — |
| 2013-04-26 | 581-823 | not yet reported which blocks → | TELUS Quebec | 8083 | Baie-Comeau (Hauterive) | — |
| 2013-04-26 | 581-824 | not yet reported which blocks → | TELUS Quebec | 8083 | Rimouski | — |
| 2013-04-26 | 581-825 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Georges-de-Beauce | — |
| 2013-04-26 | 581-826 | not yet reported which blocks → | TELUS Quebec | 8083 | Sept-Iles | — |
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.