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 |
|---|---|---|---|---|---|---|---|
| 2019-07-10 | 423-374-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2019-07-09 | 423-712-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | BLUFF CITY | TN |
| 2019-07-09 | 423-850-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | JONESBORO | TN |
| 2019-06-28 | 423-251-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2019-06-28 | 423-524-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-06-28 | 423-524-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-06-28 | 423-524-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-06-25 | 423-228-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | SO PITTSBG | TN |
| 2019-06-25 | 423-259-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | NEWTAZWELL | TN |
| 2019-06-25 | 423-632-1XXX | 1000–1999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | WARTBURG | TN |
| 2019-06-21 | 423-615-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | COLLEGEDL | TN |
| 2019-06-19 | 423-251-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2019-06-19 | 423-251-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2019-06-19 | 423-577-1XXX | 1000–1999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | ONEIDA | TN |
| 2019-06-06 | 423-206-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-06-06 | 423-206-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-06-06 | 423-206-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-05-28 | 423-666-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2019-05-28 | 423-666-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2019-05-24 | 423-251-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | KINGSPORT | TN |
| 2019-05-24 | 423-497-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2019-05-24 | 423-497-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2019-05-24 | 423-524-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2019-05-24 | 423-524-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2019-05-24 | 423-556-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2019-05-24 | 423-556-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2019-05-24 | 423-589-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | GEORGETOWN | TN |
| 2019-05-24 | 423-589-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | GEORGETOWN | TN |
| 2019-05-24 | 423-597-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-05-24 | 423-597-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-05-24 | 423-597-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-05-24 | 423-597-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-05-24 | 423-597-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-05-24 | 423-607-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | LIMESTONE | TN |
| 2019-05-24 | 423-607-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | LIMESTONE | TN |
| 2019-05-24 | 423-657-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MOSHEIM | TN |
| 2019-05-24 | 423-657-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MOSHEIM | TN |
| 2019-05-24 | 423-690-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2019-05-24 | 423-690-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2019-05-24 | 423-704-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2019-05-24 | 423-813-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2019-05-24 | 423-813-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2019-05-24 | 423-825-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2019-05-24 | 423-830-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | KINGSPORT | TN |
| 2019-05-20 | 423-621-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2019-05-20 | 423-714-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2019-05-10 | 423-564-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2019-05-10 | 423-564-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2019-05-10 | 423-564-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2019-05-08 | 423-251-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | 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.