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 |
|---|---|---|---|---|---|---|---|
| 2021-07-20 | 423-850-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JONESBORO | TN |
| 2021-07-01 | 423-689-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BRISTOL | TN |
| 2021-06-30 | 423-456-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-06-30 | 423-492-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2021-06-30 | 423-540-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2021-06-30 | 423-662-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2021-06-30 | 423-662-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2021-06-30 | 423-818-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2021-06-30 | 423-845-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BRISTOL | TN |
| 2021-06-22 | 423-456-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | LAFOLLETTE | TN |
| 2021-06-21 | 423-654-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2021-06-21 | 423-654-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2021-06-21 | 423-654-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2021-06-21 | 423-904-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| 2021-06-21 | 423-977-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| 2021-06-21 | 423-977-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| 2021-06-21 | 423-980-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| 2021-06-21 | 423-980-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| 2021-06-11 | 423-216-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2021-06-11 | 423-216-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2021-06-11 | 423-219-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2021-06-11 | 423-219-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2021-06-11 | 423-370-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2021-06-11 | 423-370-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2021-06-11 | 423-380-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2021-06-11 | 423-380-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2021-06-11 | 423-396-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | COLLEGEDL | TN |
| 2021-06-11 | 423-407-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2021-06-11 | 423-407-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2021-06-11 | 423-441-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | CUMBERLDGP | TN |
| 2021-06-11 | 423-441-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | CUMBERLDGP | TN |
| 2021-06-11 | 423-515-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2021-06-11 | 423-515-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2021-06-11 | 423-584-8XXX | 8000–8999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CLEVELAND | TN |
| 2021-06-11 | 423-644-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2021-06-11 | 423-644-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2021-06-11 | 423-675-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2021-06-11 | 423-675-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2021-06-11 | 423-679-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | OOLTEWAH | TN |
| 2021-06-11 | 423-679-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | OOLTEWAH | TN |
| 2021-06-11 | 423-934-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2021-06-11 | 423-955-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | WHITWELL | TN |
| 2021-06-11 | 423-955-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | WHITWELL | TN |
| 2021-06-10 | 423-340-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BRISTOL | TN |
| 2021-06-10 | 423-340-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | BRISTOL | TN |
| 2021-06-10 | 423-501-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2021-06-10 | 423-501-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2021-06-10 | 423-560-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ERWIN | TN |
| 2021-06-10 | 423-560-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ERWIN | TN |
| 2021-06-10 | 423-583-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | 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.