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 |
|---|---|---|---|---|---|---|---|
| 2009-04-08 | 423-484-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2009-04-08 | 423-721-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2009-04-08 | 423-994-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-04-08 | 423-994-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-04-08 | 423-994-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-04-08 | 423-994-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-04-08 | 423-994-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-04-01 | 423-646-0XXX | 0000–0999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | BRISTOL | TN |
| 2009-03-16 | 423-328-4XXX | 4000–4999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| 2009-03-16 | 423-676-0XXX | 0000–0999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| 2009-03-06 | 423-402-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-03-06 | 423-457-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2009-03-06 | 423-508-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2009-03-06 | 423-509-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2009-03-06 | 423-915-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2009-03-03 | 423-464-9XXX | 9000–9999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CLEVELAND | TN |
| 2009-02-25 | 423-457-8XXX | 8000–8999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CLEVELAND | TN |
| 2009-02-19 | 423-484-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2009-02-19 | 423-484-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2009-02-16 | 423-579-1XXX | 1000–1999 | Assigned | MOUNTAINET TELEPHONE COMPANY - TN | 008A | KINGSPORT | TN |
| 2009-02-16 | 423-930-1XXX | 1000–1999 | Assigned | MOUNTAINET TELEPHONE COMPANY - VA | 3185 | JOHNSON CY | TN |
| 2009-02-11 | 423-293-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | ROGERSVL | TN |
| 2009-02-10 | 423-223-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ONEIDA | TN |
| 2009-02-10 | 423-391-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BLUFF CITY | TN |
| 2009-02-10 | 423-425-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2009-02-10 | 423-457-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2009-02-10 | 423-525-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2009-02-10 | 423-839-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2009-02-10 | 423-948-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | LIMESTONE | TN |
| 2009-02-09 | 423-435-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2009-02-09 | 423-435-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2009-02-04 | 423-484-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2009-01-21 | 423-291-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MOUNTAINCY | TN |
| 2009-01-15 | 423-484-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2009-01-06 | 423-437-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LAFOLLETTE | TN |
| 2009-01-06 | 423-578-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2009-01-06 | 423-994-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2008-12-18 | 423-484-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2008-12-18 | 423-484-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2008-12-04 | 423-438-5XXX | 5000–5999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2008-12-03 | 423-274-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2008-12-03 | 423-457-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-12-03 | 423-457-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2008-12-03 | 423-557-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2008-11-28 | 423-567-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | DAYTON | TN |
| 2008-11-25 | 423-274-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BRISTOL | TN |
| 2008-11-25 | 423-328-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JOHNSON CY | TN |
| 2008-11-25 | 423-331-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CLEVELAND | TN |
| 2008-11-20 | 423-297-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ELIZABTHTN | TN |
| 2008-11-20 | 423-721-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | 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.