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 431
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 |
|---|---|---|---|---|---|---|
| 2024-09-23 | 431-681 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winnipeg | — |
| 2023-07-10 | 431-370 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winnipeg | — |
| 2022-12-15 | 431-369 | not yet reported which blocks → | Fibernetics Corporation | 464D | Swan Lake | — |
| 2022-12-13 | 431-368 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stonewall | — |
| 2022-08-16 | 431-246 | not yet reported which blocks → | Fibernetics Corporation | 464D | Rathwell | — |
| 2022-08-16 | 431-247 | not yet reported which blocks → | Fibernetics Corporation | 464D | Roland | — |
| 2022-08-16 | 431-248 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sidney | — |
| 2022-08-16 | 431-249 | not yet reported which blocks → | Fibernetics Corporation | 464D | Somerset | — |
| 2022-08-16 | 431-250 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sperling | — |
| 2022-08-16 | 431-375 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Adolphe | — |
| 2022-08-16 | 431-376 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Claude | — |
| 2022-08-16 | 431-377 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Francois Xavier | — |
| 2022-08-16 | 431-378 | not yet reported which blocks → | Fibernetics Corporation | 464D | Starbuck | — |
| 2022-08-16 | 431-379 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stephenfield | — |
| 2022-03-29 | 431-543 | not yet reported which blocks → | Fibernetics Corporation | 464D | Amaranth | — |
| 2022-03-29 | 431-544 | not yet reported which blocks → | Fibernetics Corporation | 464D | Austin | — |
| 2022-03-29 | 431-545 | not yet reported which blocks → | Fibernetics Corporation | 464D | Crystal City | — |
| 2022-03-29 | 431-546 | not yet reported which blocks → | Fibernetics Corporation | 464D | Edwin | — |
| 2022-03-29 | 431-547 | not yet reported which blocks → | Fibernetics Corporation | 464D | Elm Creek | — |
| 2022-03-29 | 431-548 | not yet reported which blocks → | Fibernetics Corporation | 464D | Gladstone | — |
| 2022-03-29 | 431-549 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hazelridge | — |
| 2022-03-29 | 431-550 | not yet reported which blocks → | Fibernetics Corporation | 464D | Holland | — |
| 2022-03-29 | 431-551 | not yet reported which blocks → | Fibernetics Corporation | 464D | Langruth | — |
| 2022-03-29 | 431-783 | not yet reported which blocks → | Fibernetics Corporation | 464D | Miami | — |
| 2022-03-29 | 431-784 | not yet reported which blocks → | Fibernetics Corporation | 464D | Notre Dame de Lourdes | — |
| 2022-03-29 | 431-785 | not yet reported which blocks → | Fibernetics Corporation | 464D | Oakville | — |
| 2022-03-29 | 431-786 | not yet reported which blocks → | Fibernetics Corporation | 464D | Poplar Point | — |
| 2021-12-10 | 431-455 | not yet reported which blocks → | Fibernetics Corporation | 464D | Pilot Mound | — |
| 2021-12-10 | 431-456 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sanford | — |
| 2021-12-10 | 431-457 | not yet reported which blocks → | Fibernetics Corporation | 464D | Southport | — |
| 2021-12-09 | 431-452 | not yet reported which blocks → | Fibernetics Corporation | 464D | Dugald | — |
| 2021-12-09 | 431-453 | not yet reported which blocks → | Fibernetics Corporation | 464D | Elie | — |
| 2021-12-09 | 431-454 | not yet reported which blocks → | Fibernetics Corporation | 464D | Macgregor | — |
| 2021-01-07 | 431-925 | not yet reported which blocks → | Fibernetics Corporation | 464D | Oakbank | — |
| 2020-09-29 | 431-926 | not yet reported which blocks → | Fibernetics Corporation | 464D | Anola | — |
| 2020-09-29 | 431-927 | not yet reported which blocks → | Fibernetics Corporation | 464D | Macdonald | — |
| 2020-09-29 | 431-928 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stonewall | — |
| 2020-09-29 | 431-929 | not yet reported which blocks → | Fibernetics Corporation | 464D | Swan Lake | — |
| 2020-09-29 | 431-930 | not yet reported which blocks → | Fibernetics Corporation | 464D | Treherne | — |
| 2020-07-30 | 431-932 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winnipeg | — |
| 2020-04-16 | 431-931 | not yet reported which blocks → | Fibernetics Corporation | 464D | Portage La Prairie | — |
| 2018-05-08 | 431-314 | not yet reported which blocks → | Fibernetics Corporation | 464D | Oakbank | — |
| 2018-05-08 | 431-315 | not yet reported which blocks → | Fibernetics Corporation | 464D | Portage La Prairie | — |
| 2017-08-09 | 431-307 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winnipeg | — |
| 2016-05-04 | 431-451 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winnipeg | — |
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.