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 |
|---|---|---|---|---|---|---|---|
| 2010-10-07 | 423-429-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-10-06 | 423-707-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-10-06 | 423-707-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-09-09 | 423-315-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-09-09 | 423-315-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-09-08 | 423-207-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY | TN |
| 2010-09-08 | 423-212-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2010-09-08 | 423-226-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHURCHHILL | TN |
| 2010-09-08 | 423-347-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROGERSVL | TN |
| 2010-09-08 | 423-391-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLUFF CITY | TN |
| 2010-09-08 | 423-444-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LIMESTONE | TN |
| 2010-09-08 | 423-509-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-09-08 | 423-707-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ELIZABTHTN | TN |
| 2010-09-08 | 423-788-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JONESBORO | TN |
| 2010-09-02 | 423-460-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MOUNTAINCY | TN |
| 2010-08-31 | 423-599-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | CLEVELAND | TN |
| 2010-08-27 | 423-388-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ERWIN | TN |
| 2010-08-27 | 423-525-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2010-08-27 | 423-567-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | DAYTON | TN |
| 2010-08-25 | 423-572-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | ENGLEWOOD | TN |
| 2010-08-16 | 423-408-7XXX | 7000–7999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | KINGSPORT | TN |
| 2010-08-11 | 423-371-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2010-08-10 | 423-406-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY SUL | TN |
| 2010-08-10 | 423-408-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2010-08-10 | 423-415-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWPORT | TN |
| 2010-07-30 | 423-358-5XXX | 5000–5999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ROGERSVL | TN |
| 2010-07-30 | 423-381-4XXX | 4000–4999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2010-07-30 | 423-381-5XXX | 5000–5999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| 2010-07-13 | 423-293-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | ROGERSVL | TN |
| 2010-07-07 | 423-531-2XXX | 2000–2999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-07-07 | 423-531-5XXX | 5000–5999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-07-07 | 423-771-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-07-02 | 423-381-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | ATHENS | TN |
| 2010-06-28 | 423-273-8XXX | 8000–8999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2010-06-23 | 423-259-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | NEWTAZWELL | TN |
| 2010-06-15 | 423-328-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOHNSON CY | TN |
| 2010-06-07 | 423-545-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MADISONVL | TN |
| 2010-06-07 | 423-579-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-06-07 | 423-579-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-06-07 | 423-637-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-05-28 | 423-226-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHURCHHILL | TN |
| 2010-05-25 | 423-707-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ELIZABTHTN | TN |
| 2010-05-21 | 423-207-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MIDWAY | TN |
| 2010-05-21 | 423-218-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2010-05-21 | 423-291-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MOUNTAINCY | TN |
| 2010-05-21 | 423-330-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ERWIN | TN |
| 2010-05-21 | 423-347-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROGERSVL | TN |
| 2010-05-21 | 423-377-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2010-05-21 | 423-380-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2010-05-21 | 423-391-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLUFF CITY | 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.