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 |
|---|---|---|---|---|---|---|
| — | 931-949 | 4XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SHELBYVL | TN |
| — | 931-950 | not yet reported which blocks → | TN | |||
| — | 931-958 | not yet reported which blocks → | TN | |||
| — | 931-959 | not yet reported which blocks → | TN | |||
| — | 931-962 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | WINCHESTER | TN |
| — | 931-964 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SUMMERTOWN | TN |
| — | 931-967 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | WINCHESTER | TN |
| — | 931-968 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | WINCHESTER | TN |
| — | 931-976 | not yet reported which blocks → | TN | |||
| — | 931-979 | 8XXX9XXX which blocks → | UNITED STATES CELLULAR - TN | 6278 | COOKEVILLE | TN |
| — | 931-980 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CLARKSVL | TN |
| — | 931-987 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CULLEOKA | TN |
| — | 931-988 | not yet reported which blocks → | 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.