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 |
|---|---|---|---|---|---|---|---|
| 2019-04-10 | 423-589-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | GEORGETOWN | TN |
| 2019-04-04 | 423-328-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-04-04 | 423-427-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-04-04 | 423-524-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | JOHNSON CY | TN |
| 2019-03-28 | 423-594-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | DAYTON | TN |
| 2019-03-28 | 423-594-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | DAYTON | TN |
| 2019-03-28 | 423-651-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2019-03-28 | 423-651-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2019-03-28 | 423-658-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | WHITWELL | TN |
| 2019-03-28 | 423-799-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2019-03-27 | 423-225-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2019-03-27 | 423-228-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2019-03-27 | 423-250-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2019-03-27 | 423-250-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2019-03-27 | 423-397-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2019-03-27 | 423-556-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2019-03-27 | 423-556-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2019-03-27 | 423-761-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | COPPERBSIN | TN |
| 2019-03-27 | 423-810-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2019-03-27 | 423-810-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2019-03-04 | 423-497-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-03-04 | 423-541-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-02-28 | 423-417-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2019-02-28 | 423-417-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2019-02-28 | 423-417-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2019-02-25 | 423-565-1XXX | 1000–1999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | DECATUR | TN |
| 2019-02-19 | 423-427-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2019-02-19 | 423-427-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2019-02-04 | 423-830-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | KINGSPORT | TN |
| 2019-01-09 | 423-269-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2018-12-26 | 423-482-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2018-12-13 | 423-205-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2018-12-13 | 423-376-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| 2018-12-13 | 423-376-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| 2018-12-13 | 423-389-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2018-12-13 | 423-406-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2018-12-13 | 423-565-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | DECATUR | TN |
| 2018-12-13 | 423-565-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | DECATUR | TN |
| 2018-12-13 | 423-830-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | KINGSPORT | TN |
| 2018-12-13 | 423-830-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | KINGSPORT | TN |
| 2018-12-03 | 423-206-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2018-11-29 | 423-373-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BULLS GAP | TN |
| 2018-11-09 | 423-840-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2018-10-30 | 423-500-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROGERSVL | TN |
| 2018-10-25 | 423-345-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2018-10-25 | 423-373-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BULLS GAP | TN |
| 2018-10-25 | 423-382-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2018-10-17 | 423-259-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWTAZWELL | TN |
| 2018-10-03 | 423-840-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2018-10-01 | 423-370-2XXX | 2000–2999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | 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.