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 |
|---|---|---|---|---|---|---|
| — | 641-856 | 7XXX9XXX which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | CENTERVL | IA |
| — | 641-862 | 2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | WILLIAMSON | IA |
| — | 641-869 | 7XXX8XXX9XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | WELLSBURG | IA |
| — | 641-874 | 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | PROMISE CY | IA |
| — | 641-877 | 5XXX7XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | HUMESTON | IA |
| — | 641-898 | 3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | SEYMOUR | IA |
| — | 641-932 | 0XXX4XXX6XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | ALBIA | IA |
| — | 641-933 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | FREMONT | IA |
| — | 641-934 | 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | BLADENSBG | IA |
| — | 641-935 | 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | CHILLICOTH | IA |
| — | 641-936 | 2XXX3XXX5XXX6XXX9XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | DOUDS | IA |
| — | 641-937 | 8XXX9XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | AGENCY | IA |
| — | 641-938 | 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | BLAKESBURG | IA |
| — | 641-942 | 2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | MILO | IA |
| — | 641-943 | 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | ATTICA | IA |
| — | 641-944 | 2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | BUSSEY | IA |
| — | 641-946 | 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | LOVILIA | IA |
| — | 641-947 | 7XXX8XXX · 2 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | MELCHER | IA |
| — | 641-949 | 2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | TRACY | IA |
| — | 641-969 | 2XXX6XXX8XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | EDDYVILLE | 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.