NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| — | 641-293 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | SO EMMONS | IA |
| — | 641-561 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | BUFFALOCTR | IA |
| — | 641-562 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | BUFFALOCTR | IA |
| — | 641-565 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | CRYSTAL LK | IA |
| — | 641-566 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | RAKE | IA |
| — | 641-567 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | LELAND | IA |
| — | 641-568 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | SCARVILLE | IA |
| — | 641-581 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | FORESTCITY | IA |
| — | 641-584 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | THOMPSON | IA |
| — | 641-588 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | JOICE | IA |
| — | 641-591 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | LAKE MILLS | IA |
| — | 641-592 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | LAKE MILLS | IA |
| — | 641-748 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | GRAFTON | IA |
| — | 641-797 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | FERTILE | IA |
| — | 641-845 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | KENSETT | IA |
| — | 641-896 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | HANLONTOWN | IA |
| — | 641-926 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | WODEN | IA |
| — | 641-927 | not yet reported which blocks → | WINNEBAGO COOP. TEL. ASSN. - IA | 1337 | MILLER | IA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.