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 365
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 |
|---|---|---|---|---|---|---|
| 2024-12-31 | 365-352 | not yet reported which blocks → | Fibernetics Corporation | 464D | Brooklin | — |
| 2024-12-31 | 365-409 | not yet reported which blocks → | Fibernetics Corporation | 464D | Newcastle | — |
| 2024-09-06 | 365-491 | not yet reported which blocks → | Fibernetics Corporation | 464D | Aurora | — |
| 2024-09-06 | 365-492 | not yet reported which blocks → | Fibernetics Corporation | 464D | Maple | — |
| 2024-09-06 | 365-493 | not yet reported which blocks → | Fibernetics Corporation | 464D | Unionville | — |
| 2024-06-24 | 365-627 | not yet reported which blocks → | Fibernetics Corporation | 464D | Clarkson | — |
| 2024-06-24 | 365-628 | not yet reported which blocks → | Fibernetics Corporation | 464D | Malton | — |
| 2024-06-24 | 365-629 | not yet reported which blocks → | Fibernetics Corporation | 464D | Port Credit | — |
| 2024-06-24 | 365-630 | not yet reported which blocks → | Fibernetics Corporation | 464D | Streetsville | — |
| 2023-10-27 | 365-488 | not yet reported which blocks → | Fibernetics Corporation | 464D | Brampton | — |
| 2023-10-27 | 365-489 | not yet reported which blocks → | Fibernetics Corporation | 464D | Castlemore | — |
| 2023-10-27 | 365-490 | not yet reported which blocks → | Fibernetics Corporation | 464D | Snelgrove | — |
| 2023-09-06 | 365-981 | not yet reported which blocks → | Fibernetics Corporation | 464D | Burlington | — |
| 2023-08-31 | 365-974 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Catharines-Thorold | — |
| 2023-08-25 | 365-679 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bowmanville | — |
| 2023-08-09 | 365-982 | not yet reported which blocks → | Fibernetics Corporation | 464D | Binbrook | — |
| 2023-08-09 | 365-983 | not yet reported which blocks → | Fibernetics Corporation | 464D | Dundas | — |
| 2023-08-09 | 365-984 | not yet reported which blocks → | Fibernetics Corporation | 464D | Grimsby | — |
| 2023-08-09 | 365-985 | not yet reported which blocks → | Fibernetics Corporation | 464D | West Lincoln | — |
| 2023-08-09 | 365-986 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winona | — |
| 2023-01-09 | 365-496 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ancaster | — |
| 2023-01-09 | 365-497 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hamilton | — |
| 2023-01-09 | 365-498 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stoney Creek | — |
| 2022-11-11 | 365-348 | not yet reported which blocks → | Fibernetics Corporation | 464D | Milton | — |
| 2022-11-11 | 365-349 | not yet reported which blocks → | Fibernetics Corporation | 464D | Oakville | — |
| 2022-11-10 | 365-346 | not yet reported which blocks → | Fibernetics Corporation | 464D | Campbellville | — |
| 2022-11-10 | 365-347 | not yet reported which blocks → | Fibernetics Corporation | 464D | Georgetown | — |
| 2022-08-25 | 365-279 | not yet reported which blocks → | Fibernetics Corporation | 464D | Clarkson | — |
| 2022-08-25 | 365-280 | not yet reported which blocks → | Fibernetics Corporation | 464D | Port Credit | — |
| 2022-08-25 | 365-281 | not yet reported which blocks → | Fibernetics Corporation | 464D | Streetsville | — |
| 2022-08-12 | 365-466 | not yet reported which blocks → | Fibernetics Corporation | 464D | Cayuga | — |
| 2022-08-12 | 365-467 | not yet reported which blocks → | Fibernetics Corporation | 464D | Dunnville | — |
| 2022-08-12 | 365-468 | not yet reported which blocks → | Fibernetics Corporation | 464D | Fisherville | — |
| 2022-08-12 | 365-469 | not yet reported which blocks → | Fibernetics Corporation | 464D | Port Robinson | — |
| 2022-08-12 | 365-470 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ridgeway | — |
| 2022-08-12 | 365-471 | not yet reported which blocks → | Fibernetics Corporation | 464D | Selkirk | — |
| 2022-08-12 | 365-472 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stevensville | — |
| 2022-08-12 | 365-473 | not yet reported which blocks → | Fibernetics Corporation | 464D | Wainfleet | — |
| 2022-08-12 | 365-474 | not yet reported which blocks → | Fibernetics Corporation | 464D | Wellandport | — |
| 2022-02-18 | 365-684 | not yet reported which blocks → | Fibernetics Corporation | 464D | Malton | — |
| 2022-02-17 | 365-683 | not yet reported which blocks → | Fibernetics Corporation | 464D | Cooksville | — |
| 2021-09-27 | 365-371 | not yet reported which blocks → | Fibernetics Corporation | 464D | Binbrook | — |
| 2021-09-27 | 365-372 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hagersville | — |
| 2021-09-27 | 365-373 | not yet reported which blocks → | Fibernetics Corporation | 464D | West Lincoln | — |
| 2021-09-27 | 365-374 | not yet reported which blocks → | Fibernetics Corporation | 464D | Winona | — |
| 2021-09-27 | 365-812 | not yet reported which blocks → | Fibernetics Corporation | 464D | Blackstock | — |
| 2021-09-27 | 365-813 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hampton | — |
| 2021-09-27 | 365-814 | not yet reported which blocks → | Fibernetics Corporation | 464D | Newtonville | — |
| 2021-09-27 | 365-815 | not yet reported which blocks → | Fibernetics Corporation | 464D | Orono | — |
| 2021-02-03 | 365-370 | not yet reported which blocks → | Fibernetics Corporation | 464D | Brampton | — |
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.