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 |
|---|---|---|---|---|---|---|---|
| 2012-08-30 | 423-394-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-08-30 | 423-394-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-08-30 | 423-394-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-08-17 | 423-599-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2012-08-14 | 423-243-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SODDYDAISY | TN |
| 2012-08-14 | 423-486-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2012-08-14 | 423-486-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2012-08-14 | 423-702-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2012-08-14 | 423-948-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2012-08-06 | 423-375-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BENTON | TN |
| 2012-08-06 | 423-435-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ATHENS | TN |
| 2012-07-30 | 423-458-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CLEVELAND | TN |
| 2012-07-27 | 423-797-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BRISTOL | TN |
| 2012-07-26 | 423-281-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2012-06-14 | 423-584-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2012-06-11 | 423-268-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2012-06-11 | 423-268-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2012-05-31 | 423-207-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY | TN |
| 2012-05-29 | 423-518-9XXX | 9000–9999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | ELIZABTHTN | TN |
| 2012-05-23 | 423-271-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SWEETWATER | TN |
| 2012-05-23 | 423-724-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SNEEDVILLE | TN |
| 2012-05-22 | 423-704-1XXX | 1000–1999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-22 | 423-704-2XXX | 2000–2999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-22 | 423-704-3XXX | 3000–3999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-22 | 423-704-4XXX | 4000–4999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-22 | 423-704-5XXX | 5000–5999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-22 | 423-704-6XXX | 6000–6999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2012-05-02 | 423-271-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SWEETWATER | TN |
| 2012-05-02 | 423-393-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BULLS GAP | TN |
| 2012-05-02 | 423-545-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MADISONVL | TN |
| 2012-04-30 | 423-241-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | COPPERBSIN | TN |
| 2012-04-27 | 423-516-3XXX | 3000–3999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | SULIVNGDNS | TN |
| 2012-04-27 | 423-516-4XXX | 4000–4999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | SULIVNGDNS | TN |
| 2012-04-05 | 423-254-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2012-04-03 | 423-458-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CLEVELAND | TN |
| 2012-04-03 | 423-458-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CLEVELAND | TN |
| 2012-04-03 | 423-458-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CLEVELAND | TN |
| 2012-03-28 | 423-758-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BRISTOL | TN |
| 2012-03-27 | 423-485-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2012-03-27 | 423-588-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2012-03-16 | 423-530-9XXX | 9000–9999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | KINGSPORT | TN |
| 2012-03-12 | 423-414-9XXX | 9000–9999 | Assigned | RTC SOLUTIONS, INC. - GA | 271E | CHATTNOOGA | TN |
| 2012-03-05 | 423-362-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-03-05 | 423-362-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-03-05 | 423-362-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2012-03-05 | 423-464-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2012-03-02 | 423-271-4XXX | 4000–4999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | SWEETWATER | TN |
| 2012-02-29 | 423-723-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | KINGSPORT | TN |
| 2012-02-23 | 423-516-2XXX | 2000–2999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | SULIVNGDNS | TN |
| 2012-02-22 | 423-414-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | 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.