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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2025-01-14 | 579-508 | not yet reported which blocks → | Cooptel | 818D | Lavaltrie | — |
| 2023-07-20 | 579-398 | not yet reported which blocks → | Cooptel | 818D | Lanoraie | — |
| 2023-07-20 | 579-482 | not yet reported which blocks → | Cooptel | 818D | St-Barthelemy | — |
| 2023-07-07 | 579-574 | not yet reported which blocks → | Cooptel | 818D | Ste-Marguerite | — |
| 2023-06-19 | 579-393 | not yet reported which blocks → | Cooptel | 818D | Berthierville | — |
| 2022-11-08 | 579-542 | not yet reported which blocks → | Cooptel | 818D | St-Hyacinthe | — |
| 2022-06-23 | 579-556 | not yet reported which blocks → | Cooptel | 818D | Upton | — |
| 2022-02-17 | 579-424 | not yet reported which blocks → | Cooptel | 818D | St-Michel-des-Saints | — |
| 2021-10-18 | 579-548 | not yet reported which blocks → | Cooptel | 818D | Sorel | — |
| 2021-10-01 | 579-540 | not yet reported which blocks → | Cooptel | 818D | Ste-Victoire | — |
| 2021-10-01 | 579-541 | not yet reported which blocks → | Cooptel | 818D | St-Ours | — |
| 2021-10-01 | 579-543 | not yet reported which blocks → | Cooptel | 818D | St-Pie | — |
| 2021-10-01 | 579-544 | not yet reported which blocks → | Cooptel | 818D | St-Damase | — |
| 2021-10-01 | 579-545 | not yet reported which blocks → | Cooptel | 818D | Ste-Madeleine | — |
| 2021-10-01 | 579-546 | not yet reported which blocks → | Cooptel | 818D | St-Thomas-d'Aquin | — |
| 2021-10-01 | 579-547 | not yet reported which blocks → | Cooptel | 818D | St-Zephirin | — |
| 2021-04-06 | 579-335 | not yet reported which blocks → | Cooptel | 818D | Yamaska | — |
| 2021-04-06 | 579-355 | not yet reported which blocks → | Cooptel | 818D | St-Pie-de-Guire | — |
| 2021-02-17 | 579-425 | not yet reported which blocks → | Cooptel | 818D | Joliette | — |
| 2021-02-17 | 579-426 | not yet reported which blocks → | Cooptel | 818D | St-Jacques | — |
| 2021-02-17 | 579-427 | not yet reported which blocks → | Cooptel | 818D | Ste-Julienne | — |
| 2021-02-17 | 579-428 | not yet reported which blocks → | Cooptel | 818D | L'Epiphanie-l'Assomption | — |
| 2020-05-22 | 579-444 | not yet reported which blocks → | Cooptel | 818D | St-Gabriel-de-Brandon | — |
| 2020-05-22 | 579-454 | not yet reported which blocks → | Cooptel | 818D | St-Zenon | — |
| 2019-12-23 | 579-452 | not yet reported which blocks → | Cooptel | 818D | St-Simon | — |
| 2019-12-23 | 579-453 | not yet reported which blocks → | Cooptel | 818D | Ste-Helene-de-Bagot | — |
| 2019-11-18 | 579-451 | not yet reported which blocks → | Cooptel | 818D | St-Denis | — |
| 2019-10-30 | 579-446 | not yet reported which blocks → | Cooptel | 818D | St-Felix-de-Valois | — |
| 2019-10-30 | 579-447 | not yet reported which blocks → | Cooptel | 818D | St-Alphonse-de-Rodriguez | — |
| 2019-10-30 | 579-448 | not yet reported which blocks → | Cooptel | 818D | St-Jean-de-Matha | — |
| 2019-10-30 | 579-449 | not yet reported which blocks → | Cooptel | 818D | Rawdon | — |
| 2018-08-17 | 579-445 | not yet reported which blocks → | Cooptel | 818D | St-Aime | — |
| 2018-05-15 | 579-429 | not yet reported which blocks → | Cooptel | 818D | St-Hugues | — |
| 2018-05-15 | 579-443 | not yet reported which blocks → | Cooptel | 818D | St-Jude | — |
| 2018-02-28 | 579-442 | not yet reported which blocks → | Cooptel | 818D | Granby | — |
| 2013-11-01 | 579-437 | not yet reported which blocks → | Cooptel | 818D | Eastman | — |
| 2013-11-01 | 579-439 | not yet reported which blocks → | Cooptel | 818D | Waterloo | — |
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.