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.
Most active assignees, all time — NPA 931
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 931-445 | none assigned yet which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | CRAWFORD | TN |
| — | 931-446 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | COLUMBIA | TN |
| — | 931-447 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PULASKI | TN |
| — | 931-451 | 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SPRINGHILL | TN |
| — | 931-454 | 8XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | TULLAHOMA | TN |
| — | 931-455 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | TULLAHOMA | TN |
| — | 931-456 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | CROSSVILLE | TN |
| — | 931-457 | 1XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | FAYETTEVL | TN |
| — | 931-458 | 0–9 XXXall 10 · 2 holders which blocks → | POWERTEL NASHVILLE LICENSES, INC. | 7476 | WINCHESTER | TN |
| — | 931-459 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | CROSSVILLE | TN |
| — | 931-461 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | TULLAHOMA | TN |
| — | 931-464 | 0XXX1XXX2XXX4XXX8XXX · 3 holders which blocks → | ONVOY, LLC - TN | 525E | LYNCHBURG | TN |
| — | 931-467 | not yet reported which blocks → | BEN LOMAND RURAL TEL. COOP., INC. | 0553 | PELHAM | TN |
| — | 931-468 | 4XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | ELKTON | TN |
| — | 931-469 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | HUNTLAND | TN |
| — | 931-472 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | CLARKSVL | TN |
| — | 931-473 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | MCMINNVL | TN |
| — | 931-474 | not yet reported which blocks → | BEN LOMAND COMMUNICATIONS, INC. | 4586 | MCMINNVL | TN |
| — | 931-476 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | BAXTER | TN |
| — | 931-484 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | CROSSVILLE | TN |
| — | 931-485 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SO GUTHRIE | TN |
| — | 931-486 | 4XXX8XXX · 2 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SPRINGHILL | TN |
| — | 931-487 | 1XXX5XXX8XXX · 3 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SPRINGHILL | TN |
| — | 931-488 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | SHELBYVL | TN |
| — | 931-489 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SPRINGHILL | TN |
| — | 931-490 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | COLUMBIA | TN |
| — | 931-492 | 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SHELBYVL | TN |
| — | 931-498 | not yet reported which blocks → | TWIN LAKES TEL. COOP. CORP. | 0579 | RICKMAN | TN |
| — | 931-499 | 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | SPRINGHILL | TN |
| — | 931-503 | 4XXX5XXX6XXX7XXX · 3 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CLARKSVL | TN |
| — | 931-505 | 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | POWERTEL NASHVILLE LICENSES, INC. | 7476 | COLUMBIA | TN |
| — | 931-506 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | MCMINNVL | TN |
| — | 931-507 | not yet reported which blocks → | BEN LOMAND COMMUNICATIONS, INC. | 4586 | MCMINNVL | TN |
| — | 931-510 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | COOKEVILLE | TN |
| — | 931-511 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 931-520 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | COOKEVILLE | TN |
| — | 931-525 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | COOKEVILLE | TN |
| — | 931-526 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | COOKEVILLE | TN |
| — | 931-527 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | LYNNVILLE | TN |
| — | 931-528 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | COOKEVILLE | TN |
| — | 931-529 | 6XXX7XXX8XXX which blocks → | POWERTEL NASHVILLE LICENSES, INC. | 7476 | COOKEVILLE | TN |
| — | 931-534 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DOVER | TN |
| — | 931-535 | 0XXX1XXX5XXX which blocks → | HUMPHREYS COUNTY TEL. CO. | 0566 | NEWJHNSNVL | TN |
| — | 931-536 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SHELBYVL | TN |
| — | 931-537 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | COOKEVILLE | TN |
| — | 931-538 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CLARKSVL | TN |
| — | 931-540 | 3XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | COLUMBIA | TN |
| — | 931-542 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CLARKSVL | TN |
| — | 931-544 | 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | UNITED STATES CELLULAR - TN | 6278 | COOKEVILLE | TN |
| — | 931-545 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → | UNITED STATES CELLULAR - TN | 6278 | COOKEVILLE | 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.