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 |
|---|---|---|---|---|---|---|
| 2004-01-14 | 641-207 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | KEOTA | IA |
| 2001-09-12 | 641-224 | 2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | SIGOURNEY | IA |
| 2001-09-12 | 641-225 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | EDDYVILLE | IA |
| — | 641-205 | 2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | KNOXVILLE | IA |
| — | 641-209 | 2XXX which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | FAIRFIELD | IA |
| — | 641-613 | 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | PELLA | IA |
| — | 641-814 | 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → | LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | OTTUMWA | 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.