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 |
|---|---|---|---|---|---|---|---|
| 2011-02-25 | 423-531-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2011-02-24 | 423-414-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2011-02-24 | 423-414-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2011-02-24 | 423-414-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2011-02-21 | 423-415-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWPORT | TN |
| 2011-02-21 | 423-464-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2011-02-17 | 423-289-2XXX | 2000–2999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2011-02-16 | 423-900-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2011-02-15 | 423-371-6XXX | 6000–6999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | SWEETWATER | TN |
| 2011-02-15 | 423-446-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | FALLBRANCH | TN |
| 2011-02-15 | 423-896-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | HAMPTON | TN |
| 2011-02-14 | 423-352-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2011-02-07 | 423-509-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2011-02-07 | 423-599-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2011-02-04 | 423-833-9XXX | 9000–9999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| 2011-01-24 | 423-567-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | DAYTON | TN |
| 2011-01-21 | 423-252-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | ATHENS | TN |
| 2011-01-19 | 423-455-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | JELLICO | TN |
| 2011-01-18 | 423-414-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2011-01-18 | 423-429-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2011-01-18 | 423-579-7XXX | 7000–7999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | KINGSPORT | TN |
| 2011-01-17 | 423-277-8XXX | 8000–8999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2011-01-10 | 423-388-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ERWIN | TN |
| 2011-01-07 | 423-408-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2011-01-07 | 423-408-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2011-01-07 | 423-415-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | NEWPORT | TN |
| 2011-01-07 | 423-444-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2011-01-07 | 423-486-0XXX | 0000–0999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2011-01-07 | 423-486-6XXX | 6000–6999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2011-01-07 | 423-486-7XXX | 7000–7999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2011-01-07 | 423-599-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2011-01-07 | 423-599-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2011-01-06 | 423-486-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2011-01-06 | 423-486-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2011-01-06 | 423-486-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2011-01-06 | 423-486-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2011-01-04 | 423-444-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2011-01-03 | 423-464-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CLEVELAND | TN |
| 2010-12-29 | 423-371-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2010-12-13 | 423-401-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SODDYDAISY | TN |
| 2010-12-09 | 423-444-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2010-11-19 | 423-381-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ATHENS | TN |
| 2010-11-18 | 423-381-7XXX | 7000–7999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2010-11-10 | 423-358-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ROGERSVL | TN |
| 2010-11-10 | 423-444-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2010-10-20 | 423-218-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2010-10-20 | 423-521-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-10-20 | 423-521-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-10-20 | 423-714-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2010-10-20 | 423-742-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BRISTOL | 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.