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 |
|---|---|---|---|---|---|---|
| 2018-03-08 | 319-839 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | MARENGO | IA |
| 2016-07-28 | 319-299 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | BELLEPLAIN | IA |
| 2015-06-25 | 319-220 | 0–9 XXXall 10 · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | CENTRAL CY | IA |
| 2015-06-25 | 319-722 | 1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WILLIAMSBG | IA |
| 2015-06-25 | 319-789 | 0–9 XXXall 10 · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WASHINGTON | IA |
| — | 319-224 | 0XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | TROY MILLS | IA |
| — | 319-345 | 0XXX5XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | REINBECK | IA |
| — | 319-438 | 2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | CENTRAL CY | IA |
| — | 319-444 | 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | BELLEPLAIN | IA |
| — | 319-448 | 0XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WALKER | IA |
| — | 319-478 | 0XXX4XXX7XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | TRAER | IA |
| — | 319-628 | 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | OXFORD | IA |
| — | 319-635 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | FAIRBANK | IA |
| — | 319-636 | 6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | HAZLETON | IA |
| — | 319-642 | 0XXX4XXX6XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | MARENGO | IA |
| — | 319-645 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | TIFFIN | IA |
| — | 319-653 | not yet reported which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WASHINGTON | IA |
| — | 319-662 | 0XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | CONROY | IA |
| — | 319-668 | 0XXX4XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WILLIAMSBG | IA |
| — | 319-698 | 0XXX3XXX5XXX6XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | W CHESTER | IA |
| — | 319-863 | 4XXX5XXX6XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WASHINGTON | 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.