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 |
|---|---|---|---|---|---|---|---|
| 2016-05-23 | 423-436-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| 2016-05-23 | 423-455-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2016-05-23 | 423-455-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2016-05-23 | 423-500-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2016-05-23 | 423-500-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2016-05-23 | 423-523-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BULLS GAP | TN |
| 2016-05-23 | 423-561-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SWEETWATER | TN |
| 2016-05-23 | 423-561-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SWEETWATER | TN |
| 2016-05-23 | 423-592-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-05-23 | 423-592-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-05-23 | 423-592-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-05-23 | 423-616-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2016-05-23 | 423-616-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2016-05-23 | 423-616-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2016-05-23 | 423-717-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-05-23 | 423-717-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-05-23 | 423-717-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-05-23 | 423-720-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2016-05-23 | 423-720-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2016-05-23 | 423-720-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2016-05-23 | 423-724-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2016-05-23 | 423-724-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2016-05-20 | 423-680-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2016-05-02 | 423-539-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ONEIDA | TN |
| 2016-04-27 | 423-445-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2016-04-27 | 423-803-0XXX | 0000–0999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-04-27 | 423-803-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-04-27 | 423-803-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-04-07 | 423-354-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2016-04-07 | 423-530-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2016-04-01 | 423-680-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-04-01 | 423-680-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-04-01 | 423-680-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-03-29 | 423-270-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | ERWIN | TN |
| 2016-03-25 | 423-651-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | JASPER | TN |
| 2016-03-22 | 423-701-1XXX | 1000–1999 | Assigned | UNITED STATES CELLULAR - TN | 6278 | ROBBINS | TN |
| 2016-03-17 | 423-436-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| 2016-03-17 | 423-436-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| 2016-03-14 | 423-594-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | DAYTON | TN |
| 2016-03-14 | 423-594-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | DAYTON | TN |
| 2016-03-11 | 423-205-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2016-03-11 | 423-205-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2016-03-09 | 423-358-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2016-03-09 | 423-358-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2016-03-09 | 423-651-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2016-03-09 | 423-651-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | JASPER | TN |
| 2016-03-09 | 423-810-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2016-03-09 | 423-810-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | CHARLESTON | TN |
| 2016-03-08 | 423-445-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2016-03-08 | 423-445-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | 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.