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 437
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 |
|---|---|---|---|---|---|---|
| 2024-08-13 | 437-320 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-367 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-378 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-379 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-464 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-465 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-466 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-467 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-468 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-469 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-470 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-471 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-472 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-474 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-475 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2024-08-13 | 437-476 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-10-24 | 437-738 | not yet reported which blocks → | Iristel Inc. | 346J | Toronto | — |
| 2023-10-24 | 437-739 | not yet reported which blocks → | Iristel Inc. | 346J | Toronto | — |
| 2023-10-24 | 437-740 | not yet reported which blocks → | Iristel Inc. | 346J | Toronto | — |
| 2023-07-27 | 437-530 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-27 | 437-531 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-27 | 437-532 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-523 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-524 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-525 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-526 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-527 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-528 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-07-25 | 437-529 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-05-31 | 437-493 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2023-05-31 | 437-494 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2022-02-03 | 437-293 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2021-08-16 | 437-292 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2021-02-11 | 437-290 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2021-02-11 | 437-291 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2020-08-27 | 437-447 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2020-08-27 | 437-500 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2020-08-27 | 437-600 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2020-08-27 | 437-747 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2020-08-27 | 437-900 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2019-09-25 | 437-701 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2019-09-25 | 437-702 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2019-09-25 | 437-703 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2019-07-02 | 437-374 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2019-07-02 | 437-375 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2018-12-11 | 437-867 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2018-11-07 | 437-737 | not yet reported which blocks → | Iristel Inc. | 346J | Toronto | — |
| 2018-06-21 | 437-536 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2018-06-21 | 437-539 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
| 2018-01-11 | 437-538 | not yet reported which blocks → | Iristel Inc. | 154E | Toronto | — |
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.