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 |
|---|---|---|---|---|---|---|---|
| 2017-03-20 | 423-814-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | SWEETWATER | TN |
| 2017-03-20 | 423-856-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | ATHENS | TN |
| 2017-03-01 | 423-354-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2017-02-28 | 423-251-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2017-02-27 | 423-299-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-02-27 | 423-299-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-02-27 | 423-498-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| 2017-02-13 | 423-481-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROAN MT | TN |
| 2017-02-08 | 423-497-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | 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 |
| 2017-01-25 | 423-592-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2017-01-20 | 423-269-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-01-11 | 423-690-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | MORRISTOWN | TN |
| 2017-01-05 | 423-251-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2017-01-03 | 423-301-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2017-01-03 | 423-799-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2016-12-29 | 423-767-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JOHNSON CY | TN |
| 2016-12-22 | 423-445-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | SURGOINSVL | TN |
| 2016-12-20 | 423-528-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BAILEYTON | TN |
| 2016-12-13 | 423-900-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2016-12-12 | 423-680-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-12-12 | 423-876-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-12-12 | 423-876-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2016-12-08 | 423-621-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2016-12-08 | 423-732-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2016-12-05 | 423-375-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | BENTON | TN |
| 2016-12-05 | 423-690-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | MORRISTOWN | TN |
| 2016-12-01 | 423-876-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-12-01 | 423-876-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-11-30 | 423-761-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | COPPERBSIN | TN |
| 2016-11-10 | 423-445-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | SURGOINSVL | TN |
| 2016-11-10 | 423-546-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BULLS GAP | TN |
| 2016-11-09 | 423-682-4XXX | 4000–4999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2016-11-02 | 423-682-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-11-01 | 423-561-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2016-10-21 | 423-871-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | LAFOLLETTE | TN |
| 2016-10-10 | 423-415-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | NEWPORT | TN |
| 2016-10-06 | 423-856-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2016-10-04 | 423-652-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BRISTOL | TN |
| 2016-09-29 | 423-621-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2016-09-22 | 423-818-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2016-09-21 | 423-813-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CLEVELAND | TN |
| 2016-09-20 | 423-856-8XXX | 8000–8999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2016-09-20 | 423-856-9XXX | 9000–9999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2016-09-16 | 423-352-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-09-07 | 423-594-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | DAYTON | 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.