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 | 928-836 | 2XXX3XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | HEBER | AZ |
| 2022-02-17 | 928-534 | 0–9 XXXall 10 · 5 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | SAFFORD | AZ |
| 2022-02-17 | 928-622 | 0–9 XXXall 10 · 5 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | FLAGSTAFF | AZ |
| 2022-02-16 | 928-624 | 5XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | QUARTZSITE | AZ |
| 2022-02-16 | 928-625 | 0XXX5XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | PARKER DAM | AZ |
| 2022-02-16 | 928-743 | 7XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BOUSE | AZ |
| 2022-02-16 | 928-876 | 0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | EHRENBERG | AZ |
| 2022-02-10 | 928-664 | 2XXX4XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CIBOLA | AZ |
| 2022-02-10 | 928-746 | 7XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | HARQUHLVLY | AZ |
| 2022-02-10 | 928-786 | 6XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | HYDER | AZ |
| 2022-02-10 | 928-843 | 0–9 XXXall 10 · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | SOMERTON | AZ |
| 2022-02-10 | 928-886 | 0XXX6XXX8XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ST JOHNS | AZ |
| 2022-02-01 | 928-665 | 5XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | GRANDCNYON | AZ |
| 2022-01-14 | 928-872 | 1XXX3XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BULLHDCYN | AZ |
| 2022-01-13 | 928-878 | 0XXX7XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | GILA BEND | AZ |
| 2022-01-10 | 928-546 | 0–9 XXXall 10 · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BULLHEADCY | AZ |
| 2020-11-04 | 928-837 | 0XXX1XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | YUCCA | AZ |
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.