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 |
|---|---|---|---|---|---|---|
| 2022-10-12 | 579-423 | not yet reported which blocks → | Videotron Ltd. | 328F | Longueuil | — |
| 2021-02-09 | 579-528 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Adele | — |
| 2020-12-18 | 579-559 | not yet reported which blocks → | Videotron Ltd. | 328F | Joliette | — |
| 2020-01-21 | 579-529 | not yet reported which blocks → | Videotron Ltd. | 8306 | Valcourt | — |
| 2019-10-07 | 579-957 | not yet reported which blocks → | Videotron Ltd. | 328F | Longueuil | — |
| 2019-02-12 | 579-422 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Hippolyte | — |
| 2019-01-08 | 579-730 | not yet reported which blocks → | Videotron Ltd. | 328F | St-Jerome | — |
| 2018-12-06 | 579-537 | not yet reported which blocks → | Videotron Ltd. | 8306 | Bedford | — |
| 2018-12-06 | 579-538 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lacolle | — |
| 2018-12-04 | 579-536 | not yet reported which blocks → | Videotron Ltd. | 8306 | Napierville | — |
| 2018-11-22 | 579-533 | not yet reported which blocks → | Videotron Ltd. | 8306 | Knowlton | — |
| 2018-11-22 | 579-534 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sutton | — |
| 2018-11-22 | 579-535 | not yet reported which blocks → | Videotron Ltd. | 8306 | Frelighsburg | — |
| 2018-11-21 | 579-531 | not yet reported which blocks → | Videotron Ltd. | 8306 | Mansonville | — |
| 2018-11-21 | 579-532 | not yet reported which blocks → | Videotron Ltd. | 8306 | Eastman | — |
| 2017-06-08 | 579-375 | not yet reported which blocks → | Videotron Ltd. | 8306 | Venise-en-Quebec | — |
| 2017-03-15 | 579-645 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Michel-des-Saints | — |
| 2017-03-13 | 579-374 | not yet reported which blocks → | Videotron Ltd. | 8306 | Pierreville | — |
| 2017-02-02 | 579-373 | not yet reported which blocks → | Videotron Ltd. | 328F | St-Sauveur | — |
| 2017-02-02 | 579-421 | not yet reported which blocks → | Videotron Ltd. | 328F | Longueuil | — |
| 2017-01-31 | 579-369 | not yet reported which blocks → | Videotron Ltd. | 328F | Sorel | — |
| 2017-01-31 | 579-371 | not yet reported which blocks → | Videotron Ltd. | 328F | St-Hyacinthe | — |
| 2017-01-31 | 579-372 | not yet reported which blocks → | Videotron Ltd. | 328F | St-Jean | — |
| 2017-01-31 | 579-420 | not yet reported which blocks → | Videotron Ltd. | 328F | Granby | — |
| 2017-01-31 | 579-961 | not yet reported which blocks → | Videotron Ltd. | 328F | Valleyfield | — |
| 2017-01-26 | 579-368 | not yet reported which blocks → | Videotron Ltd. | 328F | St-Jerome | — |
| 2017-01-26 | 579-960 | not yet reported which blocks → | Videotron Ltd. | 328F | Joliette | — |
| 2017-01-23 | 579-366 | not yet reported which blocks → | Videotron Ltd. | 328F | Lachute | — |
| 2017-01-11 | 579-643 | not yet reported which blocks → | Videotron Ltd. | 8306 | Berthierville | — |
| 2017-01-11 | 579-644 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lanoraie | — |
| 2016-12-20 | 579-642 | not yet reported which blocks → | Videotron Ltd. | 8306 | Mirabel-Aeroport | — |
| 2016-06-07 | 579-640 | not yet reported which blocks → | Videotron Ltd. | 8306 | Chomedey | — |
| 2016-06-07 | 579-641 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Rose | — |
| 2016-02-10 | 579-639 | not yet reported which blocks → | Videotron Ltd. | 8306 | Mascouche | — |
| 2016-01-07 | 579-365 | not yet reported which blocks → | Videotron Ltd. | 8306 | Granby | — |
| 2015-12-22 | 579-638 | not yet reported which blocks → | Videotron Ltd. | 8306 | Vaudreuil | — |
| 2015-11-25 | 579-364 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Jean-de-Matha | — |
| 2015-11-09 | 579-363 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sorel | — |
| 2015-11-09 | 579-637 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Therese | — |
| 2015-10-13 | 579-636 | not yet reported which blocks → | Videotron Ltd. | 8306 | Joliette | — |
| 2015-09-18 | 579-362 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Jean | — |
| 2015-09-08 | 579-635 | not yet reported which blocks → | Videotron Ltd. | 8306 | Le Gardeur | — |
| 2015-08-28 | 579-634 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Jerome | — |
| 2015-08-18 | 579-441 | not yet reported which blocks → | Videotron Ltd. | 8306 | Mansonville | — |
| 2015-08-17 | 579-633 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Eustache | — |
| 2015-08-12 | 579-361 | not yet reported which blocks → | Videotron Ltd. | 328F | Granby | — |
| 2015-07-30 | 579-723 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Lambert | — |
| 2015-07-07 | 579-359 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lanoraie | — |
| 2015-06-15 | 579-632 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lachute | — |
| 2015-05-06 | 579-280 | not yet reported which blocks → | Videotron Ltd. | 8306 | 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.