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 |
|---|---|---|---|---|---|---|
| — | 423-253 | none assigned yet which blocks → | TELLICO TEL. CO., INC. | 0578 | TELLICO PL | TN |
| — | 423-261 | none assigned yet which blocks → | TELLICO TEL. CO., INC. | 0578 | COKERCREEK | TN |
| — | 423-295 | 7XXX8XXX9XXX which blocks → | TELLICO TEL. CO., INC. | 0578 | BALL PLAY | TN |
| — | 423-462 | none assigned yet which blocks → | TELLICO TEL. CO., INC. | 0578 | RICEVILLE | TN |
| — | 423-568 | 1XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | TELLICO TEL. CO., INC. | 0578 | NIOTA | TN |
| — | 423-884 | not yet reported which blocks → | TELLICO TEL. CO., INC. | 0578 | VONORE | TN |
| — | 423-887 | 1XXX6XXX9XXX · 2 holders which blocks → | TELLICO TEL. CO., INC. | 0578 | ENGLEWOOD | TN |
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.