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 |
|---|---|---|---|---|---|---|---|
| 2010-05-21 | 423-438-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2010-05-21 | 423-440-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ELIZABTHTN | TN |
| 2010-05-21 | 423-444-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LIMESTONE | TN |
| 2010-05-21 | 423-453-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ATHENS | TN |
| 2010-05-21 | 423-484-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BRISTOL | TN |
| 2010-05-21 | 423-525-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | GREENEVL | TN |
| 2010-05-21 | 423-567-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | DAYTON | TN |
| 2010-05-21 | 423-710-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-05-21 | 423-763-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-05-21 | 423-788-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JONESBORO | TN |
| 2010-05-21 | 423-834-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-05-21 | 423-954-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-05-13 | 423-212-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BLOUNTVL | TN |
| 2010-04-21 | 423-258-0XXX | 0000–0999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | MORRISTOWN | TN |
| 2010-04-13 | 423-273-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2010-04-09 | 423-302-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-04-09 | 423-302-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-04-09 | 423-302-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-04-09 | 423-453-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| 2010-04-06 | 423-408-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | KINGSPORT | TN |
| 2010-04-01 | 423-414-0XXX | 0000–0999 | Assigned | PEACE COMMUNICATIONS, LLC - TN | 967F | CHATTNOOGA | TN |
| 2010-03-31 | 423-521-4XXX | 4000–4999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-03-31 | 423-521-6XXX | 6000–6999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-03-31 | 423-591-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-03-26 | 423-201-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2010-03-26 | 423-371-8XXX | 8000–8999 | Assigned | POWERTEL NASHVILLE LICENSES, INC. | 7476 | SWEETWATER | TN |
| 2010-03-24 | 423-289-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | TN |
| 2010-03-19 | 423-408-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2010-03-19 | 423-710-7XXX | 7000–7999 | Assigned | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| 2010-03-18 | 423-328-6XXX | 6000–6999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | JOHNSON CY | TN |
| 2010-03-18 | 423-375-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BENTON | TN |
| 2010-03-12 | 423-453-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ATHENS | TN |
| 2010-03-12 | 423-665-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHARLESTON | TN |
| 2010-03-11 | 423-415-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | NEWPORT | TN |
| 2010-03-09 | 423-451-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SODDYDAISY | TN |
| 2010-03-09 | 423-464-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CLEVELAND | TN |
| 2010-03-09 | 423-529-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GEORGETOWN | TN |
| 2010-03-09 | 423-567-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DAYTON | TN |
| 2010-03-09 | 423-939-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | JASPER | TN |
| 2010-03-08 | 423-223-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ONEIDA | TN |
| 2010-03-08 | 423-248-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | NEWPORT | TN |
| 2010-03-08 | 423-702-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-03-08 | 423-702-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-03-08 | 423-930-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-02-19 | 423-463-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-02-11 | 423-201-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LAFOLLETTE | TN |
| 2010-02-11 | 423-218-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-02-11 | 423-218-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-02-11 | 423-218-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2010-02-11 | 423-218-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | 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.