NumberResearchRecent prefix assignments
375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026
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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 423-649 | 4XXX6XXX7XXX8XXX · 2 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | ATHENS | TN |
| — | 423-650 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| — | 423-651 | 0–9 XXXall 10 · 6 holders which blocks → | TELNYX LLC | 073H | JASPER | TN |
| — | 423-652 | 5XXX which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | BRISTOL | TN |
| — | 423-653 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-655 | not yet reported which blocks → | SPOK, INC. | 6630 | CHATTNOOGA | TN |
| — | 423-658 | 1XXX3XXX4XXX8XXX · 4 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | WHITWELL | TN |
| — | 423-662 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| — | 423-663 | none assigned yet which blocks → | HIGHLAND TEL. COOP, INC. | 0565 | HUNTSVILLE | TN |
| — | 423-664 | 2XXX3XXX6XXX7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| — | 423-667 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| — | 423-668 | 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-676 | 0XXX which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| — | 423-677 | 4XXX which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | FALLBRANCH | TN |
| — | 423-697 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-698 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-700 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 423-704 | 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-709 | 3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | CLEVELAND | TN |
| — | 423-711 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 423-714 | 0XXX4XXX6XXX7XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | MORRISTOWN | TN |
| — | 423-715 | 7XXX8XXX9XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| — | 423-716 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | CLEVELAND | TN |
| — | 423-718 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| — | 423-721 | 7XXX8XXX9XXX · 2 holders which blocks → | UNITED STATES CELLULAR - TN | 6278 | NEWPORT | TN |
| — | 423-722 | 3XXX6XXX7XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JOHNSON CY | TN |
| — | 423-723 | 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | KINGSPORT | TN |
| — | 423-724 | 3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | SNEEDVILLE | TN |
| — | 423-725 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | HAMPTON | TN |
| — | 423-726 | 1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MIDWAY SUL | TN |
| — | 423-727 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | MOUNTAINCY | TN |
| — | 423-728 | 8XXX9XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CLEVELAND | TN |
| — | 423-733 | 3XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SNEEDVILLE | TN |
| — | 423-735 | 2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | ERWIN | TN |
| — | 423-736 | 8XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| — | 423-737 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| — | 423-739 | not yet reported which blocks → | SKYLINE TEL. MEMBERSHIP CORP. | 0501 | SHADY VLY | TN |
| — | 423-741 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| — | 423-742 | 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | BRISTOL | TN |
| — | 423-743 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | ERWIN | TN |
| — | 423-744 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | ATHENS | TN |
| — | 423-745 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | ATHENS | TN |
| — | 423-746 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | ATHENS | TN |
| — | 423-747 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| — | 423-748 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MORRISTOWN | TN |
| — | 423-751 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-752 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-753 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JONESBORO | TN |
| — | 423-754 | 7XXX8XXX9XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ROGERSVL | TN |
| — | 423-755 | 1XXX3XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.