NumberResearchRecent thousands-block assignments
13 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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 |
|---|---|---|---|---|---|---|---|
| 2008-09-17 | 423-254-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | TN |
| 2008-09-17 | 423-531-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2008-09-10 | 423-441-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CUMBERLDGP | TN |
| 2008-09-05 | 423-297-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2008-09-05 | 423-437-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LAFOLLETTE | TN |
| 2008-09-05 | 423-637-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-08-27 | 423-591-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2008-08-25 | 423-321-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2008-08-25 | 423-433-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-08-25 | 423-584-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CLEVELAND | TN |
| 2008-08-15 | 423-532-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEWPORT | TN |
| 2008-08-13 | 423-426-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2008-08-12 | 423-217-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2008-08-12 | 423-532-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2008-08-06 | 423-223-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ONEIDA | TN |
| 2008-08-06 | 423-260-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-08-06 | 423-260-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-08-06 | 423-307-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2008-08-06 | 423-331-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-08-06 | 423-836-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2008-07-25 | 423-939-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | JASPER | TN |
| 2008-07-10 | 423-307-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2008-07-10 | 423-637-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-07-10 | 423-637-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-07-09 | 423-331-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-07-09 | 423-429-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2008-07-09 | 423-453-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2008-07-09 | 423-637-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-07-09 | 423-637-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-07-09 | 423-637-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-07-03 | 423-223-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ONEIDA | TN |
| 2008-06-23 | 423-402-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2008-06-23 | 423-591-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2008-06-23 | 423-591-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2008-06-18 | 423-331-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-06-18 | 423-823-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2008-06-17 | 423-297-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ELIZABTHTN | TN |
| 2008-06-11 | 423-404-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MADISONVL | TN |
| 2008-06-11 | 423-429-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2008-06-11 | 423-429-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2008-06-11 | 423-521-9XXX | 9000–9999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-06-11 | 423-532-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2008-06-11 | 423-637-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-06-11 | 423-637-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-06-06 | 423-426-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | LIMESTONE | TN |
| 2008-06-05 | 423-305-9XXX | 9000–9999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-06-05 | 423-475-0XXX | 0000–0999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2008-05-29 | 423-823-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | GREENEVL | TN |
| 2008-05-22 | 423-289-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2008-05-22 | 423-289-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.