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 |
|---|---|---|---|---|---|---|---|
| 2010-02-11 | 423-254-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MORRISTOWN | TN |
| 2010-02-11 | 423-300-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SNEEDVILLE | TN |
| 2010-02-11 | 423-371-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2010-02-11 | 423-440-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-02-11 | 423-440-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-02-11 | 423-464-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2010-02-11 | 423-579-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-02-11 | 423-579-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-02-11 | 423-579-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-02-11 | 423-588-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2010-02-10 | 423-248-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | NEWPORT | TN |
| 2010-02-10 | 423-406-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MIDWAY SUL | TN |
| 2010-02-10 | 423-408-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2010-02-10 | 423-521-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-02-02 | 423-218-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | JOHNSON CY | TN |
| 2010-02-02 | 423-299-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2010-02-02 | 423-393-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BULLS GAP | TN |
| 2010-02-02 | 423-451-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SODDYDAISY | TN |
| 2010-02-02 | 423-724-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SNEEDVILLE | TN |
| 2010-02-01 | 423-521-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2010-01-27 | 423-302-1XXX | 1000–1999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-302-2XXX | 2000–2999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-302-3XXX | 3000–3999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-302-4XXX | 4000–4999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-302-5XXX | 5000–5999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-302-6XXX | 6000–6999 | Assigned | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| 2010-01-27 | 423-380-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| 2010-01-08 | 423-444-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LIMESTONE | TN |
| 2010-01-08 | 423-735-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | ERWIN | TN |
| 2010-01-07 | 423-588-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2010-01-07 | 423-599-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CLEVELAND | TN |
| 2010-01-06 | 423-300-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SNEEDVILLE | TN |
| 2010-01-06 | 423-377-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LAFOLLETTE | TN |
| 2010-01-06 | 423-402-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHATTNOOGA | TN |
| 2010-01-06 | 423-440-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-01-06 | 423-440-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ELIZABTHTN | TN |
| 2010-01-06 | 423-509-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2010-01-06 | 423-579-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | KINGSPORT | TN |
| 2010-01-06 | 423-735-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ERWIN | TN |
| 2010-01-06 | 423-754-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ROGERSVL | TN |
| 2010-01-06 | 423-771-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHATTNOOGA | TN |
| 2010-01-06 | 423-836-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | SWEETWATER | TN |
| 2010-01-06 | 423-930-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2009-12-30 | 423-223-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ONEIDA | TN |
| 2009-12-28 | 423-402-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | CHATTNOOGA | TN |
| 2009-12-17 | 423-525-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | GREENEVL | TN |
| 2009-12-14 | 423-347-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ROGERSVL | TN |
| 2009-12-14 | 423-707-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ELIZABTHTN | TN |
| 2009-12-04 | 423-201-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | LAFOLLETTE | TN |
| 2009-12-04 | 423-248-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | 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.