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
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2023-02-13 | 579-343 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Frelighsburg | — |
| 2022-10-18 | 579-383 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Clarenceville | — |
| 2022-10-18 | 579-384 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Henryville | — |
| 2022-10-18 | 579-481 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Denis | — |
| 2022-10-18 | 579-701 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Marc | — |
| 2022-10-18 | 579-768 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Mansonville | — |
| 2022-10-18 | 579-769 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Paul-D'Abbotsford | — |
| 2022-10-18 | 579-817 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lachute | — |
| 2022-07-12 | 579-395 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Huntingdon | — |
| 2022-07-12 | 579-396 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Franklin Centre | — |
| 2022-07-12 | 579-397 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ormstown | — |
| 2021-05-04 | 579-565 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Calixte-de-Kilkenny | — |
| 2021-05-04 | 579-566 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Hippolyte | — |
| 2021-05-04 | 579-567 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Lin | — |
| 2021-05-03 | 579-334 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Cesaire | — |
| 2021-05-03 | 579-336 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Waterloo | — |
| 2021-05-03 | 579-551 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Mirabel-St-Augustin | — |
| 2020-08-17 | 579-385 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Bromont | — |
| 2020-08-17 | 579-386 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Dunham | — |
| 2020-08-17 | 579-387 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Knowlton | — |
| 2020-08-17 | 579-388 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Sutton | — |
| 2020-08-17 | 579-389 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Julienne | — |
| 2020-08-17 | 579-390 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Oka | — |
| 2020-08-17 | 579-391 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Pierreville | — |
| 2020-07-23 | 579-330 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Marieville | — |
| 2020-07-23 | 579-331 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Vercheres | — |
| 2020-07-23 | 579-332 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Howick | — |
| 2020-05-21 | 579-889 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Blaise | — |
| 2020-05-21 | 579-890 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Zenon | — |
| 2020-05-21 | 579-891 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Yamaska | — |
| 2020-05-21 | 579-892 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Actonvale | — |
| 2017-05-19 | 579-469 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Eastman | — |
| 2016-09-07 | 579-470 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lanoraie | — |
| 2016-09-07 | 579-471 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Crabtree | — |
| 2016-09-07 | 579-472 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Berthierville | — |
| 2016-08-25 | 579-473 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rawdon | — |
| 2016-08-01 | 579-480 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Hyacinthe | — |
| 2016-07-19 | 579-474 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Le Gardeur | — |
| 2016-06-06 | 579-475 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | L'Epiphanie-l'Assomption | — |
| 2015-11-17 | 579-476 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Sauveur | — |
| 2013-08-21 | 579-258 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rawdon | — |
| 2013-08-21 | 579-259 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Le Gardeur | — |
| 2013-08-21 | 579-260 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lavaltrie | — |
| 2013-08-21 | 579-261 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lanoraie | — |
| 2013-08-21 | 579-262 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | L'Epiphanie-l'Assomption | — |
| 2013-08-21 | 579-263 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Berthierville | — |
| 2013-08-21 | 579-264 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Crabtree | — |
| 2012-07-10 | 579-477 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Therese | — |
| 2012-07-10 | 579-478 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Mirabel-Aeroport | — |
| 2012-07-10 | 579-479 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Anne-des-Plaines | — |
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.