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 |
|---|---|---|---|---|---|---|
| — | 319-728 | 9XXX which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | COLUMBSJCT | IA |
| — | 319-729 | 3XXX6XXX7XXX8XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | GRANDVIEW | IA |
| — | 319-766 | 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | OAKVILLE | IA |
| — | 319-824 | 7XXX8XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | GRUNDY CTR | IA |
| — | 319-835 | 2XXX4XXX6XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | DONNELLSON | IA |
| — | 319-836 | 0XXX3XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | PRIMROSE | IA |
| — | 319-837 | 3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | WEST POINT | IA |
| — | 319-838 | 5XXX6XXX7XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | ARGYLE | IA |
| — | 319-863 | 4XXX5XXX6XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | WASHINGTON | IA |
| — | 319-865 | 0XXX2XXX6XXX8XXX9XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | MOUNTUNION | IA |
| — | 319-878 | 0XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | FARMINGTON | IA |
| — | 319-938 | 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | ROWLEY | IA |
| — | 319-986 | not yet reported which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | MTPLEASANT | IA |
| — | 319-987 | 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | JANESVILLE | 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.