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 |
|---|---|---|---|---|---|---|
| 2003-07-24 | 712-355 | 0–9 XXXall 10 · 3 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | COUNCILBLF | IA |
| 2003-02-21 | 712-215 | 0–9 XXXall 10 · 5 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | SHENANDOAH | IA |
| 2001-11-01 | 712-395 | 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | ORANGECITY | IA |
| 2001-01-24 | 712-210 | 8XXX9XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | LIDDERDALE | IA |
| — | 712-240 | 1XXX5XXX6XXX7XXX8XXX9XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | SPENCER | IA |
| — | 712-250 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | ATLANTIC | IA |
| — | 712-254 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | ATLANTIC | IA |
| — | 712-261 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | CHEROKEE | IA |
| — | 712-270 | 1XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | SPENCER | IA |
| — | 712-320 | 8XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | SPIRITLAKE | IA |
| — | 712-350 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | HAMBURG | IA |
| — | 712-380 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | ESTHERVL | IA |
| — | 712-390 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | SIOUX RPD | IA |
| — | 712-450 | 1XXX2XXX3XXX4XXX · 4 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | LAURENS | IA |
| — | 712-480 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | EMMETSBURG | IA |
| — | 712-520 | 5XXX6XXX8XXX9XXX · 3 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | GLENWOOD | IA |
| — | 712-539 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | LE MARS | IA |
| — | 712-621 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | RED OAK | IA |
| — | 712-730 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | STORM LAKE | IA |
| — | 712-830 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | LIDDERDALE | IA |
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.