NumberResearchRecent thousands-block assignments
13 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 423
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
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-05-22 | 423-401-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2008-05-22 | 423-437-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2008-05-12 | 423-489-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CUMBERLDGP | TN |
| 2008-05-09 | 423-260-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-05-09 | 423-453-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2008-05-09 | 423-557-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-05-09 | 423-817-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2008-05-08 | 423-254-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MORRISTOWN | TN |
| 2008-05-08 | 423-285-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DAYTON | TN |
| 2008-05-08 | 423-393-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BULLS GAP | TN |
| 2008-05-05 | 423-446-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | FALLBRANCH | TN |
| 2008-05-05 | 423-896-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | HAMPTON | TN |
| 2008-05-01 | 423-278-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | GREENEVL | TN |
| 2008-05-01 | 423-815-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | WHITWELL | TN |
| 2008-05-01 | 423-815-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | WHITWELL | TN |
| 2008-04-16 | 423-815-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | WHITWELL | TN |
| 2008-04-08 | 423-278-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2008-04-08 | 423-631-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | JOHNSON CY | TN |
| 2008-04-04 | 423-557-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-03-28 | 423-433-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-03-24 | 423-342-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ELIZABTHTN | TN |
| 2008-03-20 | 423-343-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | KINGSPORT | TN |
| 2008-03-20 | 423-406-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MIDWAY SUL | TN |
| 2008-03-14 | 423-406-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY SUL | TN |
| 2008-03-14 | 423-475-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2008-03-14 | 423-475-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2008-03-14 | 423-693-1XXX | 1000–1999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-03-06 | 423-817-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2008-03-03 | 423-207-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY | TN |
| 2008-03-03 | 423-305-8XXX | 8000–8999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-02-29 | 423-297-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | ELIZABTHTN | TN |
| 2008-02-29 | 423-330-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | ERWIN | TN |
| 2008-02-29 | 423-426-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | LIMESTONE | TN |
| 2008-02-29 | 423-788-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | JONESBORO | TN |
| 2008-02-29 | 423-797-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | BRISTOL | TN |
| 2008-02-20 | 423-328-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOHNSON CY | TN |
| 2008-02-08 | 423-293-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ROGERSVL | TN |
| 2008-02-08 | 423-307-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | TN |
| 2008-02-08 | 423-428-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | DAYTON | TN |
| 2008-02-06 | 423-305-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2008-02-06 | 423-305-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2008-02-06 | 423-428-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DAYTON | TN |
| 2008-02-04 | 423-331-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-02-04 | 423-557-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-01-21 | 423-429-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2008-01-07 | 423-305-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-01-04 | 423-255-0XXX | 0000–0999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-01-04 | 423-591-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2008-01-04 | 423-591-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2007-12-27 | 423-333-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.