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 |
|---|---|---|---|---|---|---|---|
| 2016-03-07 | 423-454-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | DECATUR | TN |
| 2016-03-07 | 423-491-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2016-03-07 | 423-609-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2016-03-07 | 423-732-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2016-03-04 | 423-815-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | WHITWELL | TN |
| 2016-03-04 | 423-815-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | WHITWELL | TN |
| 2016-03-02 | 423-454-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | DECATUR | TN |
| 2016-03-02 | 423-454-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | DECATUR | TN |
| 2016-03-02 | 423-455-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2016-03-02 | 423-455-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2016-03-02 | 423-799-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2016-03-02 | 423-799-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SPRINGCITY | TN |
| 2016-03-01 | 423-401-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2016-03-01 | 423-401-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SODDYDAISY | TN |
| 2016-03-01 | 423-529-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | GEORGETOWN | TN |
| 2016-03-01 | 423-529-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | GEORGETOWN | TN |
| 2016-03-01 | 423-615-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | COLLEGEDL | TN |
| 2016-03-01 | 423-761-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | COPPERBSIN | TN |
| 2016-03-01 | 423-761-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | COPPERBSIN | TN |
| 2016-03-01 | 423-973-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2016-03-01 | 423-973-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2016-02-29 | 423-301-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2016-02-29 | 423-301-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | SO PITTSBG | TN |
| 2016-02-29 | 423-375-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2016-02-29 | 423-375-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BENTON | TN |
| 2016-02-29 | 423-561-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | SWEETWATER | TN |
| 2016-02-29 | 423-561-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | SWEETWATER | TN |
| 2016-02-26 | 423-537-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | BULLS GAP | TN |
| 2016-02-26 | 423-537-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BULLS GAP | TN |
| 2016-02-25 | 423-973-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SNEEDVILLE | TN |
| 2016-02-24 | 423-592-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-02-24 | 423-592-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2016-02-23 | 423-717-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-02-23 | 423-717-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-02-23 | 423-720-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2016-02-23 | 423-720-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2016-02-19 | 423-803-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-02-19 | 423-803-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-02-18 | 423-609-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2016-02-18 | 423-616-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2016-02-18 | 423-616-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2016-02-17 | 423-405-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2016-02-17 | 423-813-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CLEVELAND | TN |
| 2016-02-10 | 423-460-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MOUNTAINCY | TN |
| 2016-02-10 | 423-788-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | JONESBORO | TN |
| 2016-02-10 | 423-803-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-02-10 | 423-803-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2016-01-29 | 423-803-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2016-01-25 | 423-377-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2016-01-15 | 423-682-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | 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.