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 |
|---|---|---|---|---|---|---|---|
| 2016-01-15 | 423-682-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-01-15 | 423-682-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-01-15 | 423-682-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-01-11 | 423-609-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2016-01-11 | 423-616-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2016-01-11 | 423-806-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | MIDWAY | TN |
| 2016-01-11 | 423-813-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2016-01-08 | 423-803-1XXX | 1000–1999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-01-08 | 423-803-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2015-12-16 | 423-641-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2015-12-10 | 423-491-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2015-12-04 | 423-888-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-12-04 | 423-888-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-11-30 | 423-270-3XXX | 3000–3999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | ERWIN | TN |
| 2015-11-18 | 423-888-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2015-11-18 | 423-888-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2015-11-18 | 423-888-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2015-11-16 | 423-713-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-11-16 | 423-713-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-10-30 | 423-609-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2015-10-23 | 423-888-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2015-10-23 | 423-888-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2015-10-21 | 423-200-1XXX | 1000–1999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2015-10-20 | 423-281-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2015-10-20 | 423-352-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2015-10-20 | 423-609-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2015-10-20 | 423-720-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWPORT | TN |
| 2015-10-15 | 423-301-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2015-10-09 | 423-813-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2015-10-05 | 423-713-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-10-05 | 423-713-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-09-28 | 423-713-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2015-09-28 | 423-713-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2015-09-24 | 423-607-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2015-09-09 | 423-609-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2015-09-09 | 423-616-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2015-09-08 | 423-661-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-09-08 | 423-661-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-09-08 | 423-661-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-09-08 | 423-713-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2015-09-02 | 423-806-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY | TN |
| 2015-08-18 | 423-888-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2015-08-18 | 423-888-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2015-08-13 | 423-270-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ERWIN | TN |
| 2015-08-12 | 423-241-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | COPPERBSIN | TN |
| 2015-08-12 | 423-281-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2015-08-12 | 423-375-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2015-08-12 | 423-436-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MADISONVL | TN |
| 2015-08-12 | 423-732-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2015-08-12 | 423-732-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | 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.