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 |
|---|---|---|---|---|---|---|
| 2023-06-09 | 701-602 | 0XXX1XXX8XXX9XXX · 3 holders which blocks → | NUSO, LLC | 732J | DICKINSON | ND |
| 2020-08-31 | 701-503 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | NUSO, LLC | 478J | NOMCINTOSH | ND |
| 2020-08-31 | 701-505 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | NUSO, LLC | 478J | EASTSIDNEY | ND |
| 2020-08-28 | 701-979 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | NUSO, LLC | 478J | BISMARCK | ND |
| 2013-03-04 | 701-955 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → | NUSO, LLC | 551G | BISMARCK | ND |
| 2012-10-31 | 701-715 | 0–9 XXXall 10 · 3 holders which blocks → | NUSO, LLC | 478J | FARGO | ND |
| — | 701-433 | 1XXX2XXX9XXX · 3 holders which blocks → | NUSO, LLC | 732J | FARGO | ND |
| — | 701-822 | 6XXX8XXX9XXX · 3 holders which blocks → | NUSO, LLC | 732J | MINOT | ND |
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.