NumberResearchRecent prefix assignments
355 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, last 30 days
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 731-498 | not yet reported which blocks → | WEST KENTUCKY RURAL TEL | 0421 | SOUTHHAZEL | TN |
| — | 731-499 | 6XXX7XXX8XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JACKSON | TN |
| — | 731-501 | 1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BELLS | TN |
| — | 731-504 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | UNION CITY | TN |
| — | 731-506 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| — | 731-511 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 731-512 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | JACKSON | TN |
| — | 731-513 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JACKSON | TN |
| — | 731-514 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MARTIN | TN |
| — | 731-518 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | BOLIVAR | TN |
| — | 731-519 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | BROWNSVL | TN |
| — | 731-520 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | HENDERSON | TN |
| — | 731-532 | 2XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BETHEL SPG | TN |
| — | 731-536 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | TROY | TN |
| — | 731-538 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | HORNBEAK | TN |
| — | 731-540 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PARIS | TN |
| — | 731-548 | not yet reported which blocks → | MILLINGTON TEL. CO., INC. | 0571 | STANTON | TN |
| — | 731-549 | none assigned yet which blocks → | TENNESSEE TEL. CO. | 0575 | SCOTTSHILL | TN |
| — | 731-552 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MCKENZIE | TN |
| — | 731-554 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | JACKSON | TN |
| — | 731-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | TN |
| — | 731-558 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | CAMDEN | TN |
| — | 731-559 | not yet reported which blocks → | WEST KENTUCKY RURAL TELEPHONE COOPERATIVE, INC. | 598B | BRAZIL | TN |
| — | 731-562 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | HUMBOLDT | TN |
| — | 731-571 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JACKSON | TN |
| — | 731-584 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CAMDEN | TN |
| — | 731-585 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | BROWNSVL | TN |
| — | 731-586 | not yet reported which blocks → | TENNESSEE TEL. CO. | 0575 | BRUCETON | TN |
| — | 731-587 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | MARTIN | TN |
| — | 731-588 | not yet reported which blocks → | CITIZENS COMM CO TN DBA FRONTIER COMM OF TN, LLC | 4336 | MARTIN | TN |
| — | 731-589 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | DYERSBURG | TN |
| — | 731-593 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | BIG SANDY | TN |
| — | 731-595 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | HENDERSON | TN |
| — | 731-597 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | RIPLEY | TN |
| — | 731-599 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | UNION CITY | TN |
| — | 731-607 | 8XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | SAVANNAH | TN |
| — | 731-608 | 5XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | HENDERSON | TN |
| — | 731-609 | 8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BOLIVAR | TN |
| — | 731-610 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | SELMER | TN |
| — | 731-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 731-612 | 5XXX6XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | RIPLEY | TN |
| — | 731-613 | 2XXX4XXX7XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MILAN | TN |
| — | 731-614 | 9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | LEXINGTON | TN |
| — | 731-616 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JACKSON | TN |
| — | 731-617 | 4XXX5XXX6XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BELLS | TN |
| — | 731-618 | 3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | HUMBOLDT | TN |
| — | 731-623 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | TIPTONVL | TN |
| — | 731-625 | not yet reported which blocks → | AENEAS COMMUNICATIONS, LLC - TN | 2891 | HUNTINGDON | TN |
| — | 731-627 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | NEWBERN | TN |
| — | 731-630 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BROWNSVL | 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.