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 |
|---|---|---|---|---|---|---|
| 2017-12-06 | 641-631 | 0–9 XXXall 10 · 4 holders which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | CHARLES CY | IA |
| 2007-06-22 | 641-552 | 0–9 XXXall 10 · 3 holders which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | CHARLES CY | IA |
| — | 641-315 | 1XXX4XXX5XXX · 3 holders which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | MARBLEROCK | IA |
| — | 641-710 | 0XXX6XXX9XXX · 3 holders which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | STACYVILLE | IA |
| — | 641-713 | 6XXX7XXX9XXX which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | ST ANSGAR | IA |
| — | 641-816 | 1XXX7XXX · 2 holders which blocks → | OMNITEL COMMUNICATIONS, INC. - IA | 3620 | GREENE | 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.