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 |
|---|---|---|---|---|---|---|
| — | 701-348 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | GLEN ULLIN | ND |
| — | 701-363 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | MCCLUSKY | ND |
| — | 701-422 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | SELFRIDGE | ND |
| — | 701-442 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | UNDERWOOD | ND |
| — | 701-445 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | ST ANTHONY | ND |
| — | 701-447 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | MERCER | ND |
| — | 701-448 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | TURTLELAKE | ND |
| — | 701-462 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | WASHBURN | ND |
| — | 701-487 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | PICK CITY | ND |
| — | 701-584 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | ELGIN | ND |
| — | 701-597 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | FLASHER | ND |
| — | 701-622 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | CARSON | ND |
| — | 701-654 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | UNDERWOOD | ND |
| — | 701-745 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | STANTON | ND |
| — | 701-748 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | HAZEN | ND |
| — | 701-794 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | CENTER | ND |
| — | 701-827 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | FORT YATES | ND |
| — | 701-843 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | NEW SALEM | ND |
| — | 701-854 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | FORT YATES | ND |
| — | 701-873 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | BEULAH | ND |
| — | 701-878 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | HEBRON | ND |
| — | 701-884 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | GOODRICH | ND |
| — | 701-948 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | ZAP | ND |
| — | 701-983 | not yet reported which blocks → | WEST RIVER TELECOMMUNICATIONS COOP. - ND | 4413 | GOLDEN VLY | ND |
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.