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 |
|---|---|---|---|---|---|---|
| 2021-07-29 | 579-519 | not yet reported which blocks → | Fibernetics Corporation | 464D | Howick | — |
| 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 | — |
| 2021-04-26 | 579-856 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Jude | — |
| 2021-04-21 | 579-852 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Aime | — |
| 2021-04-21 | 579-853 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Helene-de-Bagot | — |
| 2021-04-21 | 579-854 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Hugues | — |
| 2021-04-21 | 579-855 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Simon | — |
| 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 | — |
| 2021-02-26 | 579-834 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Justine-de-Newton | — |
| 2021-02-26 | 579-835 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Marc | — |
| 2021-02-26 | 579-836 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Pie-de-Guire | — |
| 2021-02-26 | 579-837 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Polycarpe | — |
| 2021-02-26 | 579-850 | not yet reported which blocks → | TELUS Quebec | 2243 | Waterloo | — |
| 2021-02-25 | 579-830 | not yet reported which blocks → | TELUS Quebec | 2243 | Coteau-Landing | — |
| 2021-02-25 | 579-831 | not yet reported which blocks → | TELUS Quebec | 2243 | Knowlton | — |
| 2021-02-25 | 579-832 | not yet reported which blocks → | TELUS Quebec | 2243 | Riviere-Beaudette | — |
| 2021-02-25 | 579-833 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Denis | — |
| 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 | — |
| 2021-02-09 | 579-528 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Adele | — |
| 2021-01-15 | 579-418 | not yet reported which blocks → | Fibernetics Corporation | 464D | Napierville | — |
| 2021-01-15 | 579-419 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Blaise | — |
| 2021-01-14 | 579-412 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bedford | — |
| 2021-01-14 | 579-413 | not yet reported which blocks → | Fibernetics Corporation | 464D | Clarenceville | — |
| 2021-01-14 | 579-414 | not yet reported which blocks → | Fibernetics Corporation | 464D | Farnham | — |
| 2021-01-14 | 579-415 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hemmingford | — |
| 2021-01-14 | 579-416 | not yet reported which blocks → | Fibernetics Corporation | 464D | Henryville | — |
| 2021-01-14 | 579-417 | not yet reported which blocks → | Fibernetics Corporation | 464D | Lacolle | — |
| 2021-01-12 | 579-464 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Calixte-de-Kilkenny | — |
| 2021-01-12 | 579-465 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Hippolyte | — |
| 2021-01-12 | 579-466 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Lin | — |
| 2021-01-11 | 579-455 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Alphonse-de-Rodriguez | — |
| 2021-01-11 | 579-456 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Barthelemy | — |
| 2021-01-11 | 579-457 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Julienne | — |
| 2021-01-11 | 579-458 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Felix-de-Valois | — |
| 2021-01-11 | 579-459 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Gabriel-de-Brandon | — |
| 2021-01-11 | 579-460 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Jacques | — |
| 2021-01-11 | 579-461 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Jean-de-Matha | — |
| 2021-01-11 | 579-462 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Michel-des-Saints | — |
| 2021-01-11 | 579-463 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Zenon | — |
| 2020-12-18 | 579-559 | not yet reported which blocks → | Videotron Ltd. | 328F | Joliette | — |
| 2020-11-13 | 579-676 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Cesaire | — |
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.