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
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 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 | — |
| 2013-08-20 | 579-218 | not yet reported which blocks → | TELUS Quebec | 2243 | Laval-Est | — |
| 2013-08-20 | 579-219 | not yet reported which blocks → | TELUS Quebec | 2243 | Laval-Ouest | — |
| 2013-08-20 | 579-220 | not yet reported which blocks → | TELUS Quebec | 2243 | Chambly | — |
| 2013-08-20 | 579-221 | not yet reported which blocks → | TELUS Quebec | 2243 | Laprairie | — |
| 2013-08-20 | 579-222 | not yet reported which blocks → | TELUS Quebec | 2243 | Marieville | — |
| 2013-08-20 | 579-223 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Bruno | — |
| 2013-08-14 | 579-737 | not yet reported which blocks → | Comwave Networks | 160G | St-Cesaire | — |
| 2013-08-14 | 579-738 | not yet reported which blocks → | Comwave Networks | 160G | Dunham | — |
| 2013-08-14 | 579-739 | not yet reported which blocks → | Comwave Networks | 160G | Eastman | — |
| 2013-08-14 | 579-786 | not yet reported which blocks → | Comwave Networks | 160G | Knowlton | — |
| 2013-08-14 | 579-787 | not yet reported which blocks → | Comwave Networks | 160G | Granby | — |
| 2013-08-14 | 579-788 | not yet reported which blocks → | Comwave Networks | 160G | Mansonville | — |
| 2013-08-14 | 579-789 | not yet reported which blocks → | Comwave Networks | 160G | Sutton | — |
| 2013-08-14 | 579-797 | not yet reported which blocks → | Comwave Networks | 160G | Waterloo | — |
| 2013-07-05 | 579-248 | not yet reported which blocks → | TELUS Quebec | 2243 | Joliette | — |
| 2013-07-05 | 579-249 | not yet reported which blocks → | TELUS Quebec | 2243 | Sorel | — |
| 2013-07-05 | 579-250 | not yet reported which blocks → | TELUS Quebec | 2243 | Valleyfield | — |
| 2013-06-21 | 579-288 | not yet reported which blocks → | Comwave Networks | 160G | Chateauguay | — |
| 2013-05-07 | 579-799 | not yet reported which blocks → | Comwave Networks | 160G | Longueuil | — |
| 2013-04-16 | 579-224 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Jean | — |
| 2013-04-10 | 579-919 | not yet reported which blocks → | Comwave Networks | 160G | Pont-Viau | — |
| 2013-04-10 | 579-929 | not yet reported which blocks → | Comwave Networks | 160G | Chomedey | — |
| 2013-04-10 | 579-939 | not yet reported which blocks → | Comwave Networks | 160G | Laval-Est | — |
| 2013-04-10 | 579-969 | not yet reported which blocks → | Comwave Networks | 160G | Ste-Rose | — |
| 2013-04-10 | 579-989 | not yet reported which blocks → | Comwave Networks | 160G | Laval-Ouest | — |
| 2013-04-09 | 579-266 | not yet reported which blocks → | Comwave Networks | 160G | St-Lambert | — |
| 2013-04-09 | 579-859 | not yet reported which blocks → | Comwave Networks | 160G | Marieville | — |
| 2013-04-09 | 579-869 | not yet reported which blocks → | Comwave Networks | 160G | Laprairie | — |
| 2013-04-09 | 579-949 | not yet reported which blocks → | Comwave Networks | 160G | Beloeil | — |
| 2013-02-25 | 579-225 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Hyacinthe | — |
| 2013-02-25 | 579-226 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Therese | — |
| 2012-12-24 | 579-245 | not yet reported which blocks → | TELUS Quebec | 2243 | Saint-Liboire | — |
| 2012-12-24 | 579-246 | not yet reported which blocks → | TELUS Quebec | 2243 | Valcourt | — |
| 2012-12-24 | 579-247 | not yet reported which blocks → | TELUS Quebec | 2243 | Roxton Falls | — |
| 2012-10-24 | 579-227 | not yet reported which blocks → | TELUS Quebec | 2243 | Rigaud | — |
| 2012-10-24 | 579-228 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Rosalie | — |
| 2012-10-19 | 579-279 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Rose | — |
| 2012-10-19 | 579-379 | not yet reported which blocks → | Fibernetics Corporation | 464D | Laval-Ouest | — |
| 2012-10-19 | 579-578 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Vincent-de-Paul | — |
| 2012-10-19 | 579-679 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chomedey | — |
| 2012-10-19 | 579-779 | not yet reported which blocks → | Fibernetics Corporation | 464D | Pont-Viau | — |
| 2012-10-19 | 579-979 | not yet reported which blocks → | Fibernetics Corporation | 464D | Laval-Est | — |
| 2012-10-15 | 579-881 | not yet reported which blocks → | Fibernetics Corporation | 464D | Longueuil | — |
| 2012-10-15 | 579-884 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Bruno | — |
| 2012-10-12 | 579-880 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Lambert | — |
| 2012-10-12 | 579-882 | not yet reported which blocks → | Fibernetics Corporation | 464D | Boucherville | — |
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.