NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2025-11-18 | 431-477 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2025-11-18 | 431-479 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2025-10-15 | 431-443 | not yet reported which blocks → | Iristel Inc. | 154E | Stonewall | — |
| 2025-10-07 | 431-459 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2024-10-17 | 431-442 | not yet reported which blocks → | Iristel Inc. | 154E | Stonewall | — |
| 2024-10-17 | 431-450 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2024-10-17 | 431-640 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
| 2024-10-17 | 431-941 | not yet reported which blocks → | Iristel Inc. | 154E | Starbuck | — |
| 2024-06-14 | 431-538 | not yet reported which blocks → | Iristel Inc. | 154E | Austin | — |
| 2024-03-04 | 431-447 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2024-03-04 | 431-449 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2023-10-30 | 431-701 | not yet reported which blocks → | Iristel Inc. | 346J | Winnipeg | — |
| 2023-10-30 | 431-702 | not yet reported which blocks → | Iristel Inc. | 346J | Winnipeg | — |
| 2023-05-10 | 431-340 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
| 2022-09-22 | 431-829 | not yet reported which blocks → | Iristel Inc. | 154E | Anola | — |
| 2020-09-18 | 431-830 | not yet reported which blocks → | Iristel Inc. | 154E | Anola | — |
| 2020-09-16 | 431-306 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
| 2020-09-16 | 431-446 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2020-09-15 | 431-445 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2020-09-08 | 431-244 | not yet reported which blocks → | Iristel Inc. | 154E | Stonewall | — |
| 2020-09-01 | 431-600 | not yet reported which blocks → | Iristel Inc. | 154E | Oakbank | — |
| 2020-08-31 | 431-430 | not yet reported which blocks → | Iristel Inc. | 154E | Oakbank | — |
| 2020-08-31 | 431-500 | not yet reported which blocks → | Iristel Inc. | 154E | Oakbank | — |
| 2020-02-24 | 431-341 | not yet reported which blocks → | Iristel Inc. | 154E | Starbuck | — |
| 2020-01-29 | 431-441 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2020-01-29 | 431-444 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2019-10-28 | 431-700 | not yet reported which blocks → | Iristel Inc. | 346J | Winnipeg | — |
| 2019-10-22 | 431-815 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2019-10-22 | 431-816 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2019-10-03 | 431-533 | not yet reported which blocks → | Iristel Inc. | 154E | Austin | — |
| 2019-09-24 | 431-814 | not yet reported which blocks → | Iristel Inc. | 154E | Oakbank | — |
| 2019-09-09 | 431-809 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2019-09-09 | 431-812 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2019-09-09 | 431-813 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2018-07-05 | 431-808 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2018-06-19 | 431-532 | not yet reported which blocks → | Iristel Inc. | 154E | Starbuck | — |
| 2017-08-16 | 431-305 | not yet reported which blocks → | Iristel Inc. | 154E | Stonewall | — |
| 2017-08-16 | 431-807 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2017-06-08 | 431-631 | not yet reported which blocks → | Iristel Inc. | 154E | Anola | — |
| 2017-06-08 | 431-831 | not yet reported which blocks → | Iristel Inc. | 154E | Anola | — |
| 2017-06-06 | 431-531 | not yet reported which blocks → | Iristel Inc. | 154E | Austin | — |
| 2017-05-24 | 431-304 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
| 2016-11-09 | 431-803 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2016-11-09 | 431-804 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2016-08-31 | 431-303 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
| 2016-06-22 | 431-801 | not yet reported which blocks → | Iristel Inc. | 154E | Winnipeg | — |
| 2016-02-12 | 431-301 | not yet reported which blocks → | Iristel Inc. | 154E | Starbuck | — |
| 2016-02-12 | 431-302 | not yet reported which blocks → | Iristel Inc. | 154E | Stonewall | — |
| 2016-02-01 | 431-300 | not yet reported which blocks → | Iristel Inc. | 154E | Austin | — |
| 2016-01-19 | 431-400 | not yet reported which blocks → | Iristel Inc. | 154E | Portage La Prairie | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.