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
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2012-10-17 | 581-291 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | La Romaine | — |
| 2012-10-17 | 581-292 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Havre-Saint-Pierre | — |
| 2012-10-17 | 581-293 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Harrington Harbour | — |
| 2012-09-13 | 581-596 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Dolbeau | — |
| 2012-09-13 | 581-597 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Desbiens | — |
| 2012-09-13 | 581-598 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Delisle | — |
| 2012-09-13 | 581-599 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Chute-des-Passes | — |
| 2012-09-13 | 581-601 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Albanel | — |
| 2012-09-13 | 581-602 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Chambord | — |
| 2012-09-11 | 581-589 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Milot | — |
| 2012-09-11 | 581-590 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Metabetchouan | — |
| 2012-09-11 | 581-591 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Lac Bouchette | — |
| 2012-09-11 | 581-592 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | La Dore | — |
| 2012-09-11 | 581-593 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Hebertville-Station | — |
| 2012-09-11 | 581-594 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Hebertville | — |
| 2012-09-11 | 581-595 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Girardville | — |
| 2012-09-10 | 581-582 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Gedeon | — |
| 2012-09-10 | 581-583 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Felicien | — |
| 2012-09-10 | 581-584 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Prime | — |
| 2012-09-10 | 581-585 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Roberval | — |
| 2012-09-10 | 581-586 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Peribonka | — |
| 2012-09-10 | 581-587 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Parc-des-Laurentides | — |
| 2012-09-10 | 581-588 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Normandin | — |
| 2012-08-27 | 581-384 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Laterriere | — |
| 2012-08-27 | 581-385 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Ambroise-de-Chicoutimi | — |
| 2012-08-27 | 581-386 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Fulgence | — |
| 2012-08-27 | 581-387 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Ste-Rose-du-Nord | — |
| 2012-08-27 | 581-388 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Honore (Chicoutimi Co.) | — |
| 2012-08-27 | 581-389 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | La Baie (Chicoutimi Co.) | — |
| 2012-08-27 | 581-390 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Anse-St-Jean | — |
| 2012-08-24 | 581-382 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Ferland | — |
| 2012-08-24 | 581-383 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Jonquiere | — |
| 2011-12-13 | 581-265 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Alma | — |
| 2011-09-13 | 581-245 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sacre-Coeur | — |
| 2011-09-13 | 581-255 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sault-au-Mouton | — |
| 2011-09-13 | 581-256 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Fidele | — |
| 2011-09-13 | 581-257 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Hilarion | — |
| 2011-09-13 | 581-258 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Irenee | — |
| 2011-09-13 | 581-259 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Urbain | — |
| 2011-09-13 | 581-260 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Ste-Anne-de-Portneuf | — |
| 2011-09-13 | 581-263 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Tadoussac | — |
| 2011-09-13 | 581-264 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Simeon | — |
| 2011-09-12 | 581-236 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Baie-Ste-Catherine | — |
| 2011-09-12 | 581-237 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Baie-St-Paul | — |
| 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 | — |
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.