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 |
|---|---|---|---|---|---|---|
| 2012-10-12 | 579-883 | not yet reported which blocks → | Fibernetics Corporation | 464D | Beloeil | — |
| 2012-10-12 | 579-885 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chambly | — |
| 2012-10-12 | 579-886 | not yet reported which blocks → | Fibernetics Corporation | 464D | Laprairie | — |
| 2012-09-07 | 579-491 | not yet reported which blocks → | TELUS Mobility | 8303 | Valleyfield | — |
| 2012-08-14 | 579-274 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Longueuil | — |
| 2012-08-14 | 579-275 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Ste-Therese | — |
| 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 | — |
| 2012-06-15 | 579-243 | not yet reported which blocks → | TELUS Quebec | 2243 | Sorel | — |
| 2012-06-15 | 579-244 | not yet reported which blocks → | TELUS Quebec | 2243 | Joliette | — |
| 2012-05-18 | 579-914 | not yet reported which blocks → | Iristel Inc. | 154E | Terrebonne | — |
| 2012-05-02 | 579-999 | not yet reported which blocks → | Iristel Inc. | 154E | Longueuil | — |
| 2012-04-19 | 579-721 | not yet reported which blocks → | Videotron Ltd. | 8306 | Longueuil | — |
| 2012-04-02 | 579-589 | not yet reported which blocks → | Iristel Inc. | 154E | Granby | — |
| 2012-03-23 | 579-987 | not yet reported which blocks → | Iristel Inc. | 154E | Ste-Therese | — |
| 2012-03-23 | 579-990 | not yet reported which blocks → | Iristel Inc. | 154E | St-Jerome | — |
| 2012-03-21 | 579-500 | not yet reported which blocks → | Iristel Inc. | 154E | Joliette | — |
| 2012-03-21 | 579-800 | not yet reported which blocks → | Iristel Inc. | 154E | Laprairie | — |
| 2012-03-19 | 579-229 | not yet reported which blocks → | TELUS Quebec | 2243 | Beloeil | — |
| 2012-03-09 | 579-490 | not yet reported which blocks → | TELUS Mobility | 8303 | Vaudreuil | — |
| 2012-01-24 | 579-489 | not yet reported which blocks → | TELUS Mobility | 8303 | St-Hyacinthe | — |
| 2012-01-19 | 579-430 | not yet reported which blocks → | Videotron Ltd. | 8306 | Napierville | — |
| 2012-01-19 | 579-431 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lacolle | — |
| 2012-01-19 | 579-432 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Blaise | — |
| 2012-01-19 | 579-433 | not yet reported which blocks → | Videotron Ltd. | 8306 | Bedford | — |
| 2011-06-30 | 579-720 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Lambert | — |
| 2011-02-28 | 579-888 | not yet reported which blocks → | TELUS Mobility | 8303 | St-Jerome | — |
| 2011-02-11 | 579-765 | not yet reported which blocks → | TELUS Mobility | 8303 | St-Jerome | — |
| 2010-12-21 | 579-488 | not yet reported which blocks → | TELUS Mobility | 8303 | Granby | — |
| 2010-11-30 | 579-394 | not yet reported which blocks → | Videotron Ltd. | 8306 | Ste-Sabine | — |
| 2010-10-29 | 579-764 | not yet reported which blocks → | TELUS Mobility | 8303 | Ste-Therese | — |
| 2010-09-03 | 579-230 | not yet reported which blocks → | TELUS Quebec | 2243 | Boucherville | — |
| 2010-09-03 | 579-231 | not yet reported which blocks → | TELUS Quebec | 2243 | Chomedey | — |
| 2010-09-03 | 579-232 | not yet reported which blocks → | TELUS Quebec | 2243 | Granby | — |
| 2010-09-03 | 579-233 | not yet reported which blocks → | TELUS Quebec | 2243 | Le Gardeur | — |
| 2010-09-03 | 579-234 | not yet reported which blocks → | TELUS Quebec | 2243 | Longueuil | — |
| 2010-09-03 | 579-235 | not yet reported which blocks → | TELUS Quebec | 2243 | Mascouche | — |
| 2010-09-03 | 579-236 | not yet reported which blocks → | TELUS Quebec | 2243 | Pont-Viau | — |
| 2010-09-03 | 579-237 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Rose | — |
| 2010-09-03 | 579-238 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Therese | — |
| 2010-09-03 | 579-239 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Hyacinthe | — |
| 2010-09-03 | 579-240 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Jerome | — |
| 2010-09-03 | 579-241 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Lambert | — |
| 2010-09-03 | 579-242 | not yet reported which blocks → | TELUS Quebec | 2243 | 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.