NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026
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 343
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2024-02-06 | 343-903 | not yet reported which blocks → | Fibernetics Corporation | 464D | Smiths Falls | — |
| 2023-10-23 | 343-973 | not yet reported which blocks → | Fibernetics Corporation | 464D | Arnprior | — |
| 2023-10-23 | 343-974 | not yet reported which blocks → | Fibernetics Corporation | 464D | Kanata-Stittsville | — |
| 2023-10-23 | 343-975 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ottawa-Hull | — |
| 2023-10-03 | 343-951 | not yet reported which blocks → | Fibernetics Corporation | 464D | Brockville | — |
| 2023-10-03 | 343-952 | not yet reported which blocks → | Fibernetics Corporation | 464D | Delta | — |
| 2022-11-07 | 343-685 | not yet reported which blocks → | Fibernetics Corporation | 464D | Belleville | — |
| 2022-11-07 | 343-687 | not yet reported which blocks → | Fibernetics Corporation | 464D | Picton | — |
| 2022-02-25 | 343-649 | not yet reported which blocks → | Fibernetics Corporation | 464D | Metcalfe | — |
| 2022-02-25 | 343-650 | not yet reported which blocks → | Fibernetics Corporation | 464D | Navan | — |
| 2022-02-25 | 343-651 | not yet reported which blocks → | Fibernetics Corporation | 464D | South Mountain | — |
| 2022-02-24 | 343-646 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bourget | — |
| 2022-02-24 | 343-647 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chesterville | — |
| 2022-02-24 | 343-648 | not yet reported which blocks → | Fibernetics Corporation | 464D | Crysler | — |
| 2022-01-13 | 343-583 | not yet reported which blocks → | Fibernetics Corporation | 464D | Enterprise | — |
| 2022-01-13 | 343-584 | not yet reported which blocks → | Fibernetics Corporation | 464D | Harrowsmith | — |
| 2022-01-13 | 343-586 | not yet reported which blocks → | Fibernetics Corporation | 464D | Inverary | — |
| 2022-01-13 | 343-587 | not yet reported which blocks → | Fibernetics Corporation | 464D | Newburgh | — |
| 2022-01-13 | 343-589 | not yet reported which blocks → | Fibernetics Corporation | 464D | Odessa | — |
| 2022-01-13 | 343-590 | not yet reported which blocks → | Fibernetics Corporation | 464D | Seeleys Bay | — |
| 2022-01-13 | 343-591 | not yet reported which blocks → | Fibernetics Corporation | 464D | Selby | — |
| 2022-01-13 | 343-592 | not yet reported which blocks → | Fibernetics Corporation | 464D | Tamworth | — |
| 2022-01-13 | 343-593 | not yet reported which blocks → | Fibernetics Corporation | 464D | Verona | — |
| 2022-01-13 | 343-595 | not yet reported which blocks → | Fibernetics Corporation | 464D | Yarker | — |
| 2022-01-12 | 343-581 | not yet reported which blocks → | Fibernetics Corporation | 464D | Adolphustown | — |
| 2022-01-12 | 343-582 | not yet reported which blocks → | Fibernetics Corporation | 464D | Deseronto | — |
| 2022-01-12 | 343-594 | not yet reported which blocks → | Fibernetics Corporation | 464D | Wolfe Island | — |
| 2022-01-10 | 343-681 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Eugene | — |
| 2022-01-10 | 343-682 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Isidore | — |
| 2022-01-10 | 343-683 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Regis | — |
| 2022-01-10 | 343-684 | not yet reported which blocks → | Fibernetics Corporation | 464D | Williamsburg | — |
| 2022-01-07 | 343-676 | not yet reported which blocks → | Fibernetics Corporation | 464D | Long Sault | — |
| 2022-01-07 | 343-678 | not yet reported which blocks → | Fibernetics Corporation | 464D | Martintown | — |
| 2022-01-07 | 343-679 | not yet reported which blocks → | Fibernetics Corporation | 464D | Maxville | — |
| 2022-01-07 | 343-680 | not yet reported which blocks → | Fibernetics Corporation | 464D | Morrisburg | — |
| 2022-01-06 | 343-668 | not yet reported which blocks → | Fibernetics Corporation | 464D | Alexandria | — |
| 2022-01-06 | 343-669 | not yet reported which blocks → | Fibernetics Corporation | 464D | Avonmore | — |
| 2022-01-06 | 343-670 | not yet reported which blocks → | Fibernetics Corporation | 464D | Finch | — |
| 2022-01-06 | 343-671 | not yet reported which blocks → | Fibernetics Corporation | 464D | Glen Robertson | — |
| 2022-01-06 | 343-672 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ingleside | — |
| 2022-01-06 | 343-673 | not yet reported which blocks → | Fibernetics Corporation | 464D | Iroquois | — |
| 2022-01-06 | 343-674 | not yet reported which blocks → | Fibernetics Corporation | 464D | L'Orignal | — |
| 2022-01-06 | 343-675 | not yet reported which blocks → | Fibernetics Corporation | 464D | Lancaster | — |
| 2021-12-13 | 343-856 | not yet reported which blocks → | Fibernetics Corporation | 464D | Arden | — |
| 2021-12-13 | 343-857 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bloomfield | — |
| 2021-12-13 | 343-858 | not yet reported which blocks → | Fibernetics Corporation | 464D | Cardiff | — |
| 2021-12-13 | 343-859 | not yet reported which blocks → | Fibernetics Corporation | 464D | Coe Hill | — |
| 2021-12-13 | 343-860 | not yet reported which blocks → | Fibernetics Corporation | 464D | Denbigh | — |
| 2021-12-13 | 343-861 | not yet reported which blocks → | Fibernetics Corporation | 464D | Gilmour | — |
| 2021-12-13 | 343-862 | not yet reported which blocks → | Fibernetics Corporation | 464D | Maynooth | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.