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 |
|---|---|---|---|---|---|---|
| — | 563-944 | 0XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | LOWDEN | IA |
| — | 563-945 | 2XXX4XXX5XXX7XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | STANWOOD | IA |
| — | 563-946 | 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | ROCHESTER | IA |
| — | 563-949 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | DAVENPORT | IA |
| — | 563-950 | not yet reported which blocks → | IA | |||
| — | 563-958 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | IA | |
| — | 563-959 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | IA | |
| — | 563-964 | 5XXX which blocks → | ALPINE COMMUNICATIONS, L.C. | 1106 | GARNAVILLO | IA |
| — | 563-976 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | IA |
| — | 563-988 | not yet reported which blocks → | IA | |||
| — | 563-999 | not yet reported which blocks → | LOUISA COMMUNICATIONS, LC - IA | 4650 | MUSCATINE | 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.