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 |
|---|---|---|---|---|---|---|
| 2004-07-02 | 931-462 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | LIVINGSTON | TN |
| — | 931-243 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | CELINA | TN |
| — | 931-258 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | MOSS | TN |
| — | 931-268 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | GAINESBORO | TN |
| — | 931-403 | 7XXX which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | LIVINGSTON | TN |
| — | 931-405 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | GAINESBORO | TN |
| — | 931-432 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | COOKEVL SO | TN |
| — | 931-445 | none assigned yet which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | CRAWFORD | TN |
| — | 931-476 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | BAXTER | TN |
| — | 931-498 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | RICKMAN | TN |
| — | 931-621 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | NORTH SPG | TN |
| — | 931-653 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | GRANVILLE | TN |
| — | 931-678 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | HIGHLAND | TN |
| — | 931-752 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | JAMESTOWN | TN |
| — | 931-823 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | LIVINGSTON | TN |
| — | 931-858 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | BAXTER | TN |
| — | 931-863 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | CLARKRANGE | TN |
| — | 931-864 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | BYRDSTOWN | TN |
| — | 931-879 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | JAMESTOWN | TN |
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.