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 |
|---|---|---|---|---|---|---|---|
| 2017-11-08 | 423-720-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWPORT | TN |
| 2017-11-03 | 423-833-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | JOHNSON CY | TN |
| 2017-10-26 | 423-466-8XXX | 8000–8999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2017-10-26 | 423-466-9XXX | 9000–9999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2017-10-26 | 423-501-1XXX | 1000–1999 | Assigned | SKYBEST COMMUNICATIONS, INC. - TN | 081J | MOUNTAINCY | TN |
| 2017-10-25 | 423-252-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2017-10-23 | 423-856-1XXX | 1000–1999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2017-10-23 | 423-856-2XXX | 2000–2999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2017-10-16 | 423-500-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2017-09-27 | 423-758-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BRISTOL | TN |
| 2017-09-20 | 423-417-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-08-29 | 423-417-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| 2017-08-24 | 423-417-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2017-08-16 | 423-281-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2017-08-16 | 423-281-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2017-07-21 | 423-682-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2017-07-13 | 423-354-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2017-07-13 | 423-481-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | ROAN MT | TN |
| 2017-07-13 | 423-528-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | BAILEYTON | TN |
| 2017-07-13 | 423-607-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | LIMESTONE | TN |
| 2017-07-07 | 423-397-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-07-07 | 423-397-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2017-06-30 | 423-482-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | BLOUNTVL | TN |
| 2017-06-21 | 423-340-7XXX | 7000–7999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | BRISTOL | TN |
| 2017-06-21 | 423-340-9XXX | 9000–9999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | BRISTOL | TN |
| 2017-06-20 | 423-758-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BRISTOL | TN |
| 2017-06-08 | 423-446-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FALLBRANCH | TN |
| 2017-06-07 | 423-250-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | CLEVELAND | TN |
| 2017-06-07 | 423-498-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2017-05-23 | 423-856-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ATHENS | TN |
| 2017-05-12 | 423-577-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ONEIDA | TN |
| 2017-05-04 | 423-445-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SURGOINSVL | TN |
| 2017-05-04 | 423-520-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MADISONVL | TN |
| 2017-05-02 | 423-403-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2017-05-02 | 423-403-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2017-05-01 | 423-281-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2017-05-01 | 423-281-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BUTLER | TN |
| 2017-05-01 | 423-482-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2017-05-01 | 423-482-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2017-04-28 | 423-301-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2017-04-27 | 423-250-0XXX | 0000–0999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | CLEVELAND | TN |
| 2017-04-24 | 423-498-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| 2017-04-12 | 423-299-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2017-04-03 | 423-497-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-04-03 | 423-497-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-04-03 | 423-497-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-04-03 | 423-497-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2017-03-20 | 423-456-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | LAFOLLETTE | TN |
| 2017-03-20 | 423-500-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | ROGERSVL | TN |
| 2017-03-20 | 423-720-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | NEWPORT | 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.