NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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, all time — 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 |
|---|---|---|---|---|---|---|---|
| 2022-01-26 | 423-287-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2022-01-26 | 423-287-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | 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 |
| 2020-11-18 | 423-654-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-11-18 | 423-654-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-06-05 | 423-206-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-06-05 | 423-497-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-05-27 | 423-541-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-05-27 | 423-541-9XXX | 9000–9999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-01-31 | 423-407-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | SPRINGCITY | TN |
| 2020-01-28 | 423-515-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | SO PITTSBG | TN |
| 2020-01-28 | 423-556-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | SODDYDAISY | TN |
| 2020-01-25 | 423-565-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | DECATUR | TN |
| 2020-01-25 | 423-589-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | GEORGETOWN | TN |
| 2020-01-25 | 423-810-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHARLESTON | TN |
| 2020-01-25 | 423-939-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | JASPER | TN |
| 2019-10-25 | 423-216-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | BENTON | TN |
| 2019-10-25 | 423-658-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | WHITWELL | TN |
| 2019-07-12 | 423-594-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | DAYTON | TN |
| 2019-06-06 | 423-206-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-06-06 | 423-206-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2019-06-06 | 423-206-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | 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 |
| 2018-09-27 | 423-541-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2018-09-27 | 423-541-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2018-09-27 | 423-541-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | 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 |
| 2017-11-29 | 423-269-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-11-29 | 423-269-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-11-29 | 423-269-8XXX | 8000–8999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-02-03 | 423-498-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-02-03 | 423-498-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-02-03 | 423-498-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-02-03 | 423-498-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2017-02-03 | 423-498-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | 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 |
| 2016-06-27 | 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 |
| 2016-05-24 | 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 |
| 2016-04-27 | 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 |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.