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
Aug 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-05-11 | 437-413 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-05-11 | 437-414 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-05-06 | 437-651 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-04-29 | 437-650 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-15 | 437-423 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-15 | 437-519 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-15 | 437-649 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-15 | 437-961 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-14 | 437-287 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2022-02-14 | 437-399 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-12-21 | 437-397 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-12-21 | 437-398 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-10-08 | 437-422 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-10-08 | 437-518 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-10-08 | 437-960 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-10-06 | 437-420 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-10-06 | 437-421 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-09-15 | 437-329 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-08-31 | 437-396 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-08-24 | 437-395 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-07-20 | 437-328 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-07-02 | 437-517 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-06-28 | 437-516 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-04-26 | 437-648 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-04-22 | 437-646 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-04-20 | 437-645 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-24 | 437-515 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-23 | 437-514 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-15 | 437-513 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-08 | 437-510 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-08 | 437-512 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-03-02 | 437-644 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-26 | 437-642 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-26 | 437-643 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-25 | 437-641 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-23 | 437-509 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-18 | 437-327 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-11 | 437-326 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-03 | 437-286 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-02-02 | 437-640 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-21 | 437-508 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-19 | 437-507 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-07 | 437-285 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-07 | 437-639 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-04 | 437-284 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2021-01-04 | 437-638 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2020-12-30 | 437-636 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2020-12-29 | 437-282 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2020-12-29 | 437-283 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2020-12-29 | 437-635 | not yet reported which blocks → | Bell Mobility | 6574 | 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.