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 |
|---|---|---|---|---|---|---|---|
| 2020-12-30 | 423-607-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | LIMESTONE | TN |
| 2020-12-30 | 423-644-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | SODDYDAISY | TN |
| 2020-12-30 | 423-651-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | JASPER | TN |
| 2020-12-30 | 423-657-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | MOSHEIM | TN |
| 2020-12-30 | 423-666-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | ELIZABTHTN | TN |
| 2020-12-30 | 423-726-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | MIDWAY SUL | TN |
| 2020-12-30 | 423-732-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | KINGSPORT | TN |
| 2020-12-30 | 423-806-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | MIDWAY | TN |
| 2020-12-30 | 423-812-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | GREENEVL | TN |
| 2020-12-30 | 423-850-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | JONESBORO | TN |
| 2020-12-30 | 423-873-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | STONEY CRK | TN |
| 2020-12-30 | 423-896-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | HAMPTON | TN |
| 2020-12-30 | 423-897-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | FALLBRANCH | TN |
| 2020-12-30 | 423-955-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | WHITWELL | TN |
| 2020-12-24 | 423-216-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | BENTON | TN |
| 2020-12-24 | 423-219-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | CHARLESTON | TN |
| 2020-12-24 | 423-226-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | CHURCHHILL | TN |
| 2020-12-24 | 423-250-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | CLEVELAND | TN |
| 2020-12-24 | 423-279-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | BLOUNTVL | TN |
| 2020-12-24 | 423-340-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | BRISTOL | TN |
| 2020-12-24 | 423-659-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | COPPERBSIN | TN |
| 2020-12-24 | 423-712-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | BLUFF CITY | TN |
| 2020-12-24 | 423-840-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | BUTLER | TN |
| 2020-12-18 | 423-922-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | BAILEYTON | TN |
| 2020-12-16 | 423-347-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2020-12-16 | 423-564-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | ROGERSVL | TN |
| 2020-12-15 | 423-466-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2020-12-15 | 423-640-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| 2020-12-14 | 423-374-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2020-12-14 | 423-374-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | LAFOLLETTE | TN |
| 2020-12-08 | 423-812-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2020-12-08 | 423-850-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | JONESBORO | TN |
| 2020-12-07 | 423-670-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2020-12-07 | 423-670-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | JOHNSON CY | TN |
| 2020-11-30 | 423-604-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | ETOWAH | TN |
| 2020-11-23 | 423-456-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2020-11-23 | 423-540-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2020-11-23 | 423-690-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2020-11-23 | 423-818-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2020-11-18 | 423-654-3XXX | 3000–3999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-11-18 | 423-654-7XXX | 7000–7999 | Assigned | ELECTRIC POWER BOARD OF CHATTANOOGA | 4645 | CHATTNOOGA | TN |
| 2020-11-11 | 423-589-8XXX | 8000–8999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | GEORGETOWN | TN |
| 2020-11-11 | 423-910-8XXX | 8000–8999 | Assigned | TWIN LAKES COMMUNICATIONS, INC. - TN | 204G | OOLTEWAH | TN |
| 2020-10-02 | 423-466-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ATHENS | TN |
| 2020-09-30 | 423-671-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CHATTNOOGA | TN |
| 2020-09-25 | 423-670-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | JOHNSON CY | TN |
| 2020-09-24 | 423-264-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | VONORE | TN |
| 2020-09-17 | 423-660-6XXX | 6000–6999 | Assigned | TWILIO INTERNATIONAL, INC. | 506J | CHATTNOOGA | TN |
| 2020-08-27 | 423-269-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | CHATTNOOGA | TN |
| 2020-08-19 | 423-806-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MIDWAY | 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.