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 |
|---|---|---|---|---|---|---|---|
| 2018-08-14 | 423-621-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2018-08-14 | 423-621-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2018-08-14 | 423-690-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2018-08-02 | 423-500-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ROGERSVL | TN |
| 2018-08-01 | 423-352-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2018-07-31 | 423-651-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JASPER | TN |
| 2018-07-26 | 423-388-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ERWIN | TN |
| 2018-07-26 | 423-406-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY SUL | TN |
| 2018-07-23 | 423-657-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MOSHEIM | TN |
| 2018-07-23 | 423-840-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2018-07-16 | 423-961-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GEORGETOWN | TN |
| 2018-07-11 | 423-564-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2018-07-11 | 423-564-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2018-07-09 | 423-403-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2018-07-09 | 423-403-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2018-07-09 | 423-516-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SULIVNGDNS | TN |
| 2018-06-28 | 423-225-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2018-06-27 | 423-205-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2018-06-27 | 423-205-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2018-06-25 | 423-549-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | JOHNSON CY | TN |
| 2018-06-22 | 423-397-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BENTON | TN |
| 2018-06-01 | 423-518-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ELIZABTHTN | TN |
| 2018-05-30 | 423-226-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHURCHHILL | TN |
| 2018-05-25 | 423-564-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ROGERSVL | TN |
| 2018-05-22 | 423-541-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2018-05-22 | 423-541-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2018-05-22 | 423-541-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2018-05-22 | 423-850-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | JONESBORO | TN |
| 2018-05-18 | 423-666-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2018-05-18 | 423-666-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2018-05-18 | 423-820-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | GREENEVL | TN |
| 2018-05-18 | 423-830-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | KINGSPORT | TN |
| 2018-05-18 | 423-840-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BUTLER | TN |
| 2018-05-17 | 423-793-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | BRISTOL | TN |
| 2018-05-15 | 423-205-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2018-05-15 | 423-250-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2018-05-15 | 423-397-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2018-05-15 | 423-558-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2018-05-10 | 423-220-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ERWIN | TN |
| 2018-05-10 | 423-226-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | CHURCHHILL | TN |
| 2018-05-10 | 423-406-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2018-05-10 | 423-481-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ROAN MT | TN |
| 2018-05-10 | 423-482-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| 2018-05-10 | 423-501-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2018-05-10 | 423-512-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | STONEY CRK | TN |
| 2018-05-10 | 423-516-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | TN |
| 2018-05-10 | 423-528-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | BAILEYTON | TN |
| 2018-05-10 | 423-607-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | LIMESTONE | TN |
| 2018-05-10 | 423-657-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | MOSHEIM | TN |
| 2018-05-10 | 423-712-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | BLUFF CITY | 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.