NumberResearchRecent prefix assignments
1 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, last 30 days — NPA 579
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 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 | — |
| 2023-02-13 | 579-343 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Frelighsburg | — |
| 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 | — |
| 2022-12-05 | 579-526 | not yet reported which blocks → | Bell Canada | 984C | Contrecoeur | — |
| 2022-12-01 | 579-733 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Alphonse-de-Rodriguez | — |
| 2022-12-01 | 579-734 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Eustache | — |
| 2022-11-08 | 579-542 | not yet reported which blocks → | Cooptel | 818D | St-Hyacinthe | — |
| 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 | — |
| 2022-10-13 | 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 | 579-423 | not yet reported which blocks → | Videotron Ltd. | 328F | Longueuil | — |
| 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 | — |
| 2022-08-18 | 579-827 | not yet reported which blocks → | Iristel Inc. | 154E | Valleyfield | — |
| 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 | — |
| 2022-06-23 | 579-556 | not yet reported which blocks → | Cooptel | 818D | Upton | — |
| 2022-06-23 | 579-709 | not yet reported which blocks → | IXICA Communications Inc. | 812H | St-Jean | — |
| 2022-05-04 | 579-826 | not yet reported which blocks → | TELUS Quebec | 2243 | Mirabel-St-Augustin | — |
| 2022-04-05 | 579-825 | not yet reported which blocks → | TELUS Quebec | 2243 | Contrecoeur | — |
| 2022-03-28 | 579-367 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Hippolyte | — |
| 2022-03-28 | 579-376 | not yet reported which blocks → | TELUS Quebec | 2243 | Hemmingford | — |
| 2022-03-22 | 579-821 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Victoire | — |
| 2022-03-22 | 579-824 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Ours | — |
| 2022-03-08 | 579-820 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Remi | — |
| 2022-03-08 | 579-822 | not yet reported which blocks → | TELUS Quebec | 2243 | Mansonville | — |
| 2022-03-08 | 579-823 | not yet reported which blocks → | TELUS Quebec | 2243 | Eastman | — |
| 2022-02-17 | 579-424 | not yet reported which blocks → | Cooptel | 818D | St-Michel-des-Saints | — |
| 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 | — |
| 2021-11-23 | 579-775 | not yet reported which blocks → | IXICA Communications Inc. | 812H | Pont-Viau | — |
| 2021-11-16 | 579-399 | not yet reported which blocks → | IXICA Communications Inc. | 812H | Chomedey | — |
| 2021-11-16 | 579-577 | not yet reported which blocks → | IXICA Communications Inc. | 812H | St-Vincent-de-Paul | — |
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.