NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2026-08-11 | 437-847 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2026-06-12 | 437-897 | not yet reported which blocks → | TELUS Mobility | 646F | Toronto | — |
| 2025-10-20 | 437-487 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2024-09-17 | 437-457 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2024-09-17 | 437-797 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2024-09-17 | 437-907 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2024-01-22 | 437-734 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2023-04-24 | 437-979 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2022-10-12 | 437-848 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2022-10-12 | 437-849 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2021-03-08 | 437-786 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2021-02-19 | 437-785 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2021-02-11 | 437-784 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2021-01-26 | 437-210 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2021-01-26 | 437-679 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2020-03-23 | 437-362 | not yet reported which blocks → | TELUS Mobility | 646F | Toronto | — |
| 2020-03-23 | 437-363 | not yet reported which blocks → | TELUS Mobility | 646F | Toronto | — |
| 2019-04-17 | 437-340 | not yet reported which blocks → | TELUS Mobility | 646F | Toronto | — |
| 2019-03-20 | 437-357 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-20 | 437-358 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-20 | 437-359 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-20 | 437-360 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-20 | 437-361 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-19 | 437-354 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-19 | 437-355 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-03-19 | 437-356 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-680 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-681 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-682 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-683 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-686 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-02-14 | 437-687 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2019-01-28 | 437-685 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2018-04-27 | 437-341 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2018-04-27 | 437-342 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2018-04-27 | 437-343 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2018-04-27 | 437-684 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2017-08-02 | 437-550 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2017-08-02 | 437-850 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-200 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-201 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-202 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-203 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-204 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-205 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-206 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-207 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-208 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2016-09-21 | 437-209 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
| 2015-04-02 | 437-351 | not yet reported which blocks → | TELUS Mobility | 8303 | Toronto | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.