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 |
|---|---|---|---|---|---|---|
| 2022-02-24 | 435-567 | 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | RICHFIELD | UT |
| 2022-02-24 | 435-569 | 0XXX6XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MOAB | UT |
| 2022-01-27 | 435-737 | 1XXX2XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | TOOELE | UT |
| 2022-01-27 | 435-746 | 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | KAMAS | UT |
| 2021-04-12 | 435-547 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BRIAN HEAD | UT |
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.