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 579
New assignments by month
Sep 2026
Aug 2026
Jul 2026
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May 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 |
|---|---|---|---|---|---|---|
| 2025-04-30 | 579-576 | not yet reported which blocks → | Fibernetics Corporation | 464D | Longueuil | — |
| 2024-08-09 | 579-527 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Therese | — |
| 2024-02-06 | 579-680 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chomedey | — |
| 2024-02-06 | 579-681 | not yet reported which blocks → | Fibernetics Corporation | 464D | Pont-Viau | — |
| 2024-02-06 | 579-682 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Rose | — |
| 2024-02-06 | 579-683 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Vincent-de-Paul | — |
| 2023-06-28 | 579-932 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chateauguay | — |
| 2023-05-29 | 579-715 | not yet reported which blocks → | Fibernetics Corporation | 464D | Boucherville | — |
| 2023-05-29 | 579-716 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chambly | — |
| 2023-05-29 | 579-717 | not yet reported which blocks → | Fibernetics Corporation | 464D | Longueuil | — |
| 2023-05-24 | 579-982 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sorel | — |
| 2023-05-23 | 579-981 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Eustache | — |
| 2023-04-20 | 579-504 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Hyacinthe | — |
| 2023-04-20 | 579-507 | not yet reported which blocks → | Fibernetics Corporation | 464D | Terrebonne | — |
| 2023-02-28 | 579-874 | not yet reported which blocks → | Fibernetics Corporation | 464D | Cowansville | — |
| 2023-02-28 | 579-875 | not yet reported which blocks → | Fibernetics Corporation | 464D | Granby | — |
| 2023-02-06 | 579-933 | not yet reported which blocks → | Fibernetics Corporation | 464D | Joliette | — |
| 2023-02-02 | 579-505 | not yet reported which blocks → | Fibernetics Corporation | 464D | Laval-Est | — |
| 2023-02-02 | 579-506 | not yet reported which blocks → | Fibernetics Corporation | 464D | Laval-Ouest | — |
| 2023-02-01 | 579-980 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Jerome | — |
| 2023-01-18 | 579-392 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Jean | — |
| 2022-10-13 | 579-622 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Julie-de-Vercheres | — |
| 2022-10-13 | 579-623 | not yet reported which blocks → | Fibernetics Corporation | 464D | Vercheres | — |
| 2022-10-12 | 579-561 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mirabel-Aeroport | — |
| 2022-10-12 | 579-562 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Anne-des-Plaines | — |
| 2022-10-12 | 579-563 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Therese | — |
| 2022-10-11 | 579-382 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Lambert | — |
| 2022-02-04 | 579-521 | not yet reported which blocks → | Fibernetics Corporation | 464D | Eastman | — |
| 2022-02-04 | 579-522 | not yet reported which blocks → | Fibernetics Corporation | 464D | Frelighsburg | — |
| 2022-02-04 | 579-523 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mansonville | — |
| 2022-02-04 | 579-524 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Paul-D'Abbotsford | — |
| 2021-09-30 | 579-467 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mascouche | — |
| 2021-09-30 | 579-468 | not yet reported which blocks → | Fibernetics Corporation | 464D | Terrebonne | — |
| 2021-09-09 | 579-893 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Hyacinthe | — |
| 2021-09-09 | 579-894 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Damase | — |
| 2021-09-09 | 579-895 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Madeleine | — |
| 2021-09-09 | 579-896 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Pie | — |
| 2021-09-09 | 579-897 | not yet reported which blocks → | Fibernetics Corporation | 464D | Actonvale | — |
| 2021-08-19 | 579-349 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mirabel-St-Augustin | — |
| 2021-08-19 | 579-350 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mirabel-Ste-Scholastique | — |
| 2021-08-19 | 579-351 | not yet reported which blocks → | Fibernetics Corporation | 464D | Oka | — |
| 2021-08-19 | 579-352 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Eustache | — |
| 2021-08-03 | 579-493 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sorel | — |
| 2021-08-03 | 579-494 | not yet reported which blocks → | Fibernetics Corporation | 464D | Pierreville | — |
| 2021-08-03 | 579-495 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Denis | — |
| 2021-08-03 | 579-496 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Pie-de-Guire | — |
| 2021-08-03 | 579-497 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Zephirin | — |
| 2021-08-03 | 579-498 | not yet reported which blocks → | Fibernetics Corporation | 464D | Yamaska | — |
| 2021-08-03 | 579-515 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Chrysostome | — |
| 2021-08-03 | 579-516 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Constant | — |
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.