NumberResearchRecent thousands-block assignments
13 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 |
|---|---|---|---|---|---|---|---|
| 2016-09-07 | 423-888-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-09-06 | 423-680-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-09-06 | 423-713-0XXX | 0000–0999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-09-06 | 423-713-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-08-24 | 423-812-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2016-08-23 | 423-845-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BRISTOL | TN |
| 2016-08-18 | 423-512-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | STONEY CRK | TN |
| 2016-08-18 | 423-845-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BRISTOL | TN |
| 2016-08-18 | 423-973-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SNEEDVILLE | TN |
| 2016-08-17 | 423-516-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | SULIVNGDNS | TN |
| 2016-08-16 | 423-609-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2016-08-11 | 423-461-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | JOHNSON CY | TN |
| 2016-08-04 | 423-518-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | ELIZABTHTN | TN |
| 2016-07-27 | 423-406-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY SUL | TN |
| 2016-07-27 | 423-446-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | FALLBRANCH | TN |
| 2016-07-27 | 423-454-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | DECATUR | TN |
| 2016-07-27 | 423-460-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MOUNTAINCY | TN |
| 2016-07-27 | 423-523-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BULLS GAP | TN |
| 2016-07-26 | 423-377-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2016-07-26 | 423-388-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ERWIN | TN |
| 2016-07-26 | 423-436-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MADISONVL | TN |
| 2016-07-26 | 423-518-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ELIZABTHTN | TN |
| 2016-07-26 | 423-567-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | DAYTON | TN |
| 2016-07-26 | 423-607-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LIMESTONE | TN |
| 2016-07-25 | 423-451-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SODDYDAISY | TN |
| 2016-07-25 | 423-530-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2016-07-25 | 423-714-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2016-07-25 | 423-900-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2016-07-19 | 423-680-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2016-07-19 | 423-680-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2016-06-27 | 423-680-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-06-27 | 423-680-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-06-23 | 423-528-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BAILEYTON | TN |
| 2016-06-23 | 423-561-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SWEETWATER | TN |
| 2016-06-23 | 423-761-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | COPPERBSIN | TN |
| 2016-06-22 | 423-813-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2016-06-17 | 423-529-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | GEORGETOWN | TN |
| 2016-06-15 | 423-226-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHURCHHILL | TN |
| 2016-06-15 | 423-500-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROGERSVL | TN |
| 2016-06-01 | 423-682-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| 2016-06-01 | 423-732-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | KINGSPORT | TN |
| 2016-05-25 | 423-273-2XXX | 2000–2999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2016-05-24 | 423-682-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-05-24 | 423-682-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-05-23 | 423-205-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2016-05-23 | 423-205-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ETOWAH | TN |
| 2016-05-23 | 423-345-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2016-05-23 | 423-345-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SURGOINSVL | TN |
| 2016-05-23 | 423-393-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BULLS GAP | TN |
| 2016-05-23 | 423-436-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | MADISONVL | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.