NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| — | 712-566 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | QWEST CORPORATION | 9631 | UNDERWOOD | IA |
| — | 712-623 | 0XXX1XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | RED OAK | IA |
| — | 712-624 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | QWEST CORPORATION | 9631 | MALVERN | IA |
| — | 712-642 | 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | MISSOURVLY | IA |
| — | 712-732 | not yet reported which blocks → | QWEST CORPORATION | 9631 | STORM LAKE | IA |
| — | 712-746 | 0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | E HARRISBG | IA |
| — | 712-749 | 0XXX8XXX9XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | STORM LAKE | IA |
| — | 712-792 | not yet reported which blocks → | QWEST CORPORATION | 9631 | CARROLL | IA |
| — | 712-794 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | QWEST CORPORATION | 9631 | CARROLL | IA |
| — | 712-832 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | QWEST CORPORATION | 9631 | LAKE PARK | IA |
| — | 712-882 | 0XXX7XXX8XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | MAPLETON | IA |
| — | 712-883 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | DANBURY | IA |
| — | 712-938 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | QWEST CORPORATION | 9631 | MERRILL | IA |
| — | 712-986 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | BELOIT | IA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.