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 |
|---|---|---|---|---|---|---|
| 2013-04-16 | 581-814 | not yet reported which blocks → | TELUS Quebec | 2243 | Quebec | — |
| 2012-11-23 | 581-813 | not yet reported which blocks → | TELUS Quebec | 2243 | Beauceville | — |
| 2012-10-19 | 581-820 | not yet reported which blocks → | TELUS Quebec | 2243 | Lac-Etchemin | — |
| 2012-05-31 | 581-377 | not yet reported which blocks → | TELUS Quebec | 2243 | Leeds | — |
| 2012-05-31 | 581-378 | not yet reported which blocks → | TELUS Quebec | 2243 | Saint-Odilon | — |
| 2012-05-31 | 581-379 | not yet reported which blocks → | TELUS Quebec | 2243 | Sainte-Rose | — |
| 2012-05-31 | 581-380 | not yet reported which blocks → | TELUS Quebec | 2243 | Sainte-Justine | — |
| 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 | — |
| 2010-09-07 | 581-247 | not yet reported which blocks → | TELUS Quebec | 2243 | Charny | — |
| 2010-09-07 | 581-248 | not yet reported which blocks → | TELUS Quebec | 2243 | Chicoutimi | — |
| 2010-09-07 | 581-249 | not yet reported which blocks → | TELUS Quebec | 2243 | Jonquiere | — |
| 2010-09-07 | 581-250 | not yet reported which blocks → | TELUS Quebec | 2243 | Levis | — |
| 2010-09-07 | 581-251 | not yet reported which blocks → | TELUS Quebec | 2243 | Loretteville | — |
| 2010-09-07 | 581-252 | not yet reported which blocks → | TELUS Quebec | 2243 | Riviere-du-Loup | — |
| 2010-09-07 | 581-253 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Nicolas | — |
| 2010-09-07 | 581-254 | not yet reported which blocks → | TELUS Quebec | 2243 | Thetford Mines | — |
| 2008-09-17 | 581-815 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Gedeon | — |
| 2008-09-17 | 581-816 | not yet reported which blocks → | TELUS Quebec | 2243 | Chambord | — |
| 2008-09-17 | 581-817 | not yet reported which blocks → | TELUS Quebec | 2243 | Desbiens | — |
| 2008-09-17 | 581-818 | not yet reported which blocks → | TELUS Quebec | 2243 | Lac Bouchette | — |
| 2008-09-16 | 581-719 | not yet reported which blocks → | TELUS Quebec | 2243 | Normandin | — |
| 2008-09-09 | 581-717 | not yet reported which blocks → | TELUS Quebec | 2243 | Hebertville-Station | — |
| 2008-09-09 | 581-718 | not yet reported which blocks → | TELUS Quebec | 2243 | Hebertville | — |
| 2008-08-21 | 581-716 | not yet reported which blocks → | TELUS Quebec | 2243 | Metabetchouan | — |
| 2008-08-08 | 581-714 | not yet reported which blocks → | TELUS Quebec | 2243 | Disraeli | — |
| 2008-08-08 | 581-715 | not yet reported which blocks → | TELUS Quebec | 2243 | La Guadeloupe | — |
| 2008-08-07 | 581-713 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Honore | — |
| 2008-07-23 | 581-712 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Ferdinand-D'Halifax | — |
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.