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 |
|---|---|---|---|---|---|---|---|
| 2007-03-12 | 423-343-2XXX | 2000–2999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | KINGSPORT | TN |
| 2007-03-12 | 423-343-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2007-03-12 | 423-343-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2007-03-12 | 423-451-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | SODDYDAISY | TN |
| 2007-03-12 | 423-463-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-03-12 | 423-463-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-03-12 | 423-557-1XXX | 1000–1999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| 2007-03-12 | 423-765-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2007-03-12 | 423-790-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2007-02-28 | 423-305-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2007-02-28 | 423-305-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2007-02-28 | 423-606-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | ENGLEWOOD | TN |
| 2007-02-28 | 423-730-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | RICEVILLE | TN |
| 2007-02-26 | 423-217-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BRISTOL | TN |
| 2007-02-26 | 423-278-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | GREENEVL | TN |
| 2007-02-26 | 423-535-0XXX | 0000–0999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2007-02-26 | 423-765-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | KINGSPORT | TN |
| 2007-02-21 | 423-291-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MOUNTAINCY | TN |
| 2007-02-21 | 423-489-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CUMBERLDGP | TN |
| 2007-02-20 | 423-453-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | ATHENS | TN |
| 2007-02-20 | 423-781-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | ETOWAH | TN |
| 2007-02-12 | 423-201-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | LAFOLLETTE | TN |
| 2007-02-12 | 423-223-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ONEIDA | TN |
| 2007-02-12 | 423-293-5XXX | 5000–5999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ROGERSVL | TN |
| 2007-02-09 | 423-277-5XXX | 5000–5999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2007-02-09 | 423-388-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ERWIN | TN |
| 2007-02-09 | 423-790-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CLEVELAND | TN |
| 2007-02-06 | 423-307-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2007-02-06 | 423-435-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2007-02-06 | 423-463-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-02-06 | 423-463-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-02-06 | 423-463-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-02-05 | 423-307-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | TN |
| 2007-02-05 | 423-465-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | NEWPORT | TN |
| 2007-02-01 | 423-367-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2007-02-01 | 423-367-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| 2007-01-29 | 423-558-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2007-01-25 | 423-285-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | DAYTON | TN |
| 2007-01-22 | 423-262-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | JOHNSON CY | TN |
| 2007-01-09 | 423-217-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2007-01-09 | 423-489-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CUMBERLDGP | TN |
| 2007-01-09 | 423-723-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2007-01-09 | 423-723-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2007-01-08 | 423-463-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-01-08 | 423-463-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-01-08 | 423-463-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2007-01-04 | 423-244-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2007-01-04 | 423-293-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ROGERSVL | TN |
| 2007-01-04 | 423-765-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2007-01-04 | 423-836-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | 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.