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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-02-04 | 534-263 | 0XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MILL CREEK | WI |
| 2022-02-01 | 534-626 | 0–9 XXXall 10 · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | WAUSAU | WI |
| 2022-01-11 | 534-363 | 0XXX3XXX7XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | GRANTON | WI |
| 2022-01-11 | 534-768 | 1XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | AMBERG | WI |
| 2022-01-11 | 534-787 | 0XXX3XXX7XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MATTOON | WI |
| 2022-01-11 | 534-794 | 0XXX1XXX2XXX4XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MOSINEE | WI |
| 2022-01-11 | 534-837 | 4XXX7XXX8XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CRANDON | WI |
| 2022-01-07 | 534-227 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | COLBY | WI |
| 2021-10-01 | 534-253 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MARSHFIELD | WI |
| 2021-04-08 | 534-254 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | WAUPACA | WI |
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.