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 548
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2026-04-21 | 548-518 | not yet reported which blocks → | Fibernetics Corporation | 464D | Port Elgin | — |
| 2025-10-02 | 548-529 | not yet reported which blocks → | Fibernetics Corporation | 464D | Forest | — |
| 2025-09-02 | 548-528 | not yet reported which blocks → | Fibernetics Corporation | 464D | Aylmer | — |
| 2024-12-30 | 548-401 | not yet reported which blocks → | Fibernetics Corporation | 464D | Breslau | — |
| 2024-12-30 | 548-402 | not yet reported which blocks → | Fibernetics Corporation | 464D | Elmira | — |
| 2024-12-30 | 548-403 | not yet reported which blocks → | Fibernetics Corporation | 464D | Preston | — |
| 2024-10-10 | 548-431 | not yet reported which blocks → | Fibernetics Corporation | 464D | Caledon | — |
| 2024-10-10 | 548-432 | not yet reported which blocks → | Fibernetics Corporation | 464D | Erin | — |
| 2024-10-10 | 548-977 | not yet reported which blocks → | Fibernetics Corporation | 464D | Kitchener-Waterloo | — |
| 2024-09-06 | 548-978 | not yet reported which blocks → | Fibernetics Corporation | 464D | Orangeville | — |
| 2024-09-04 | 548-433 | not yet reported which blocks → | Fibernetics Corporation | 464D | Goderich | — |
| 2024-01-09 | 548-956 | not yet reported which blocks → | Fibernetics Corporation | 464D | Galt | — |
| 2024-01-09 | 548-957 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hespeler | — |
| 2024-01-09 | 548-972 | not yet reported which blocks → | Fibernetics Corporation | 464D | Clinton | — |
| 2023-09-05 | 548-454 | not yet reported which blocks → | Fibernetics Corporation | 464D | Sarnia | — |
| 2023-08-28 | 548-292 | not yet reported which blocks → | Fibernetics Corporation | 464D | Windsor | — |
| 2023-08-28 | 548-987 | not yet reported which blocks → | Fibernetics Corporation | 464D | Essex | — |
| 2023-08-25 | 548-974 | not yet reported which blocks → | Fibernetics Corporation | 464D | London | — |
| 2023-08-25 | 548-975 | not yet reported which blocks → | Fibernetics Corporation | 464D | Strathroy | — |
| 2023-07-27 | 548-453 | not yet reported which blocks → | Fibernetics Corporation | 464D | Woodstock | — |
| 2023-07-27 | 548-986 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. Thomas | — |
| 2023-06-26 | 548-434 | not yet reported which blocks → | Fibernetics Corporation | 464D | Owen Sound | — |
| 2023-05-17 | 548-452 | not yet reported which blocks → | Fibernetics Corporation | 464D | Guelph | — |
| 2023-03-06 | 548-514 | not yet reported which blocks → | Fibernetics Corporation | 464D | La Salle | — |
| 2023-03-01 | 548-512 | not yet reported which blocks → | Fibernetics Corporation | 464D | Amherstburg | — |
| 2023-03-01 | 548-513 | not yet reported which blocks → | Fibernetics Corporation | 464D | Kingsville | — |
| 2023-03-01 | 548-515 | not yet reported which blocks → | Fibernetics Corporation | 464D | Leamington | — |
| 2023-03-01 | 548-516 | not yet reported which blocks → | Fibernetics Corporation | 464D | Tecumseh | — |
| 2023-03-01 | 548-517 | not yet reported which blocks → | Fibernetics Corporation | 464D | Windsor | — |
| 2023-01-26 | 548-380 | not yet reported which blocks → | Fibernetics Corporation | 464D | Acton | — |
| 2023-01-26 | 548-381 | not yet reported which blocks → | Fibernetics Corporation | 464D | Rockwood | — |
| 2022-11-10 | 548-379 | not yet reported which blocks → | Fibernetics Corporation | 464D | Paris | — |
| 2022-10-06 | 548-447 | not yet reported which blocks → | Fibernetics Corporation | 464D | Norwich | — |
| 2022-10-06 | 548-449 | not yet reported which blocks → | Fibernetics Corporation | 464D | Otterville | — |
| 2022-10-06 | 548-450 | not yet reported which blocks → | Fibernetics Corporation | 464D | Princeton | — |
| 2022-10-06 | 548-451 | not yet reported which blocks → | Fibernetics Corporation | 464D | Thamesford | — |
| 2022-10-05 | 548-437 | not yet reported which blocks → | Fibernetics Corporation | 464D | Brownsville | — |
| 2022-10-05 | 548-438 | not yet reported which blocks → | Fibernetics Corporation | 464D | Drumbo | — |
| 2022-10-05 | 548-439 | not yet reported which blocks → | Fibernetics Corporation | 464D | Eastwood | — |
| 2022-10-05 | 548-441 | not yet reported which blocks → | Fibernetics Corporation | 464D | Embro | — |
| 2022-10-05 | 548-442 | not yet reported which blocks → | Fibernetics Corporation | 464D | Hickson | — |
| 2022-10-05 | 548-443 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ingersoll | — |
| 2022-10-05 | 548-445 | not yet reported which blocks → | Fibernetics Corporation | 464D | Innerkip | — |
| 2022-10-05 | 548-446 | not yet reported which blocks → | Fibernetics Corporation | 464D | Kintore | — |
| 2022-10-04 | 548-435 | not yet reported which blocks → | Fibernetics Corporation | 464D | Beachville | — |
| 2022-10-04 | 548-436 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bright | — |
| 2022-04-07 | 548-279 | not yet reported which blocks → | Fibernetics Corporation | 464D | Kitchener-Waterloo | — |
| 2022-02-24 | 548-983 | not yet reported which blocks → | Fibernetics Corporation | 464D | Mount Pleasant | — |
| 2022-02-24 | 548-984 | not yet reported which blocks → | Fibernetics Corporation | 464D | Scotland | — |
| 2022-02-24 | 548-985 | not yet reported which blocks → | Fibernetics Corporation | 464D | St. George | — |
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.