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 |
|---|---|---|---|---|---|---|---|
| 2023-03-28 | 423-817-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | KINGSPORT | TN |
| 2023-03-28 | 423-835-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BRISTOL | TN |
| 2023-03-28 | 423-913-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | JONESBORO | TN |
| 2023-03-20 | 423-940-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | DAYTON | TN |
| 2023-03-16 | 423-796-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2023-03-16 | 423-796-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2023-03-16 | 423-796-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2023-03-16 | 423-796-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2023-03-16 | 423-835-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-16 | 423-835-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2023-03-09 | 423-540-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2023-03-09 | 423-540-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2023-03-07 | 423-799-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SPRINGCITY | TN |
| 2023-03-06 | 423-659-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | COPPERBSIN | TN |
| 2023-03-03 | 423-649-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ATHENS | TN |
| 2023-03-02 | 423-831-1XXX | 1000–1999 | Assigned | NUSO, LLC | 732J | GREENEVL | TN |
| 2023-02-28 | 423-719-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2023-02-28 | 423-719-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2023-02-28 | 423-719-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2023-02-27 | 423-513-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | VONORE | TN |
| 2023-02-23 | 423-550-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY | TN |
| 2023-02-23 | 423-820-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | GREENEVL | TN |
| 2023-02-10 | 423-351-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SWEETWATER | TN |
| 2023-02-10 | 423-670-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2023-02-07 | 423-769-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | BENTON | TN |
| 2023-02-06 | 423-925-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2023-02-01 | 423-749-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | COLLEGEDL | TN |
| 2023-01-27 | 423-203-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2023-01-27 | 423-670-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2023-01-25 | 423-550-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY | TN |
| 2023-01-25 | 423-568-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | NIOTA | TN |
| 2023-01-25 | 423-615-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | COLLEGEDL | TN |
| 2023-01-25 | 423-766-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LIMESTONE | TN |
| 2023-01-24 | 423-656-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2023-01-24 | 423-812-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2023-01-24 | 423-812-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2023-01-23 | 423-819-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2023-01-23 | 423-819-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2023-01-23 | 423-819-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2023-01-23 | 423-895-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ELIZABTHTN | TN |
| 2023-01-23 | 423-895-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ELIZABTHTN | TN |
| 2023-01-17 | 423-577-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ONEIDA | TN |
| 2023-01-11 | 423-600-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | APISON | TN |
| 2023-01-11 | 423-666-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | 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.