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
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2023-10-03 | 548-353 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Oil Springs | — |
| 2023-10-03 | 548-428 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Sombra | — |
| 2023-10-03 | 548-583 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Comber | — |
| 2023-10-03 | 548-701 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Pelee Island | — |
| 2023-10-03 | 548-832 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Pleasant Park | — |
| 2023-10-02 | 548-297 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Brigden | — |
| 2023-08-01 | 548-578 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St. Jacobs | — |
| 2023-08-01 | 548-647 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Dorchester | — |
| 2023-08-01 | 548-813 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Glencoe | — |
| 2023-07-31 | 548-287 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Merlin | — |
| 2023-07-31 | 548-314 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ridgetown | — |
| 2023-07-31 | 548-462 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Thamesville | — |
| 2023-07-31 | 548-509 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Plattsville | — |
| 2023-06-21 | 548-928 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Drayton | — |
| 2023-06-21 | 548-973 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | New Dundee | — |
| 2023-06-20 | 548-296 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ohsweken | — |
| 2023-06-20 | 548-732 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St. George | — |
| 2023-05-29 | 548-467 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Paris | — |
| 2023-05-19 | 548-351 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Scotland | — |
| 2023-05-19 | 548-478 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ailsa Craig | — |
| 2023-05-19 | 548-717 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Belmont | — |
| 2023-03-21 | 548-289 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Bothwell | — |
| 2023-03-21 | 548-326 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Dresden | — |
| 2023-03-21 | 548-507 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Highgate | — |
| 2023-02-15 | 548-286 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Burford | — |
| 2023-02-15 | 548-319 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lynden | — |
| 2023-02-15 | 548-642 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Mount Pleasant | — |
| 2022-01-18 | 548-392 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Alvinston | — |
| 2022-01-18 | 548-393 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Courtright | — |
| 2022-01-18 | 548-705 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Port Lambton | — |
| 2022-01-18 | 548-706 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Watford | — |
| 2021-11-09 | 548-312 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | New Hamburg | — |
| 2021-11-05 | 548-313 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Wellesley | — |
| 2021-05-07 | 548-253 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | La Salle | — |
| 2021-05-07 | 548-659 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Crediton | — |
| 2021-05-06 | 548-252 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Emeryville | — |
| 2021-03-02 | 548-826 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rockwood | — |
| 2021-02-22 | 548-825 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Acton | — |
| 2021-02-22 | 548-879 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Caledon | — |
| 2021-02-22 | 548-892 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Blenheim | — |
| 2021-02-22 | 548-893 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Tilbury | — |
| 2021-02-18 | 548-251 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Wyoming | — |
| 2021-02-18 | 548-857 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Kingsville | — |
| 2021-02-18 | 548-858 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Exeter | — |
| 2021-02-18 | 548-859 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Strathroy | — |
| 2021-02-17 | 548-250 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Corunna | — |
| 2020-07-23 | 548-232 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Bright's Grove | — |
| 2020-07-23 | 548-233 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Petrolia | — |
| 2020-05-20 | 548-875 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Leamington | — |
| 2020-05-20 | 548-876 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Tecumseh | — |
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.