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 |
|---|---|---|---|---|---|---|---|
| 2019-05-08 | 423-732-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | KINGSPORT | TN |
| 2019-05-07 | 423-418-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2019-05-07 | 423-418-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2019-05-07 | 423-460-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2019-05-07 | 423-460-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2019-05-07 | 423-481-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | ROAN MT | TN |
| 2019-05-07 | 423-481-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | ROAN MT | TN |
| 2019-05-07 | 423-482-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| 2019-05-07 | 423-482-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| 2019-05-07 | 423-512-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | STONEY CRK | TN |
| 2019-05-07 | 423-512-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | STONEY CRK | TN |
| 2019-05-07 | 423-528-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BAILEYTON | TN |
| 2019-05-07 | 423-528-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BAILEYTON | TN |
| 2019-05-07 | 423-583-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | TN |
| 2019-05-07 | 423-583-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | TN |
| 2019-05-07 | 423-666-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2019-05-07 | 423-666-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | ELIZABTHTN | TN |
| 2019-05-07 | 423-712-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BLUFF CITY | TN |
| 2019-05-07 | 423-712-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BLUFF CITY | TN |
| 2019-05-07 | 423-793-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BRISTOL | TN |
| 2019-05-07 | 423-793-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BRISTOL | TN |
| 2019-05-07 | 423-806-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY | TN |
| 2019-05-07 | 423-806-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY | TN |
| 2019-05-07 | 423-820-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | GREENEVL | TN |
| 2019-05-07 | 423-820-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | GREENEVL | TN |
| 2019-05-07 | 423-840-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | BUTLER | TN |
| 2019-05-07 | 423-840-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | BUTLER | TN |
| 2019-05-07 | 423-850-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | JONESBORO | TN |
| 2019-05-07 | 423-850-1XXX | 1000–1999 | Assigned | ONVOY, LLC - TN | 525E | JONESBORO | TN |
| 2019-05-07 | 423-896-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | HAMPTON | TN |
| 2019-05-07 | 423-897-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | FALLBRANCH | TN |
| 2019-05-07 | 423-897-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TN | 525E | FALLBRANCH | TN |
| 2019-05-07 | 423-957-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | HAMPTON | TN |
| 2019-05-06 | 423-590-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2019-05-06 | 423-590-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2019-05-06 | 423-590-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2019-05-06 | 423-590-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2019-05-06 | 423-590-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | SO PITTSBG | TN |
| 2019-04-24 | 423-370-0XXX | 0000–0999 | Assigned | ONVOY, LLC - TN | 525E | ATHENS | TN |
| 2019-04-24 | 423-417-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | CHATTNOOGA | TN |
| 2019-04-24 | 423-558-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | CHATTNOOGA | TN |
| 2019-04-24 | 423-621-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2019-04-16 | 423-226-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | CHURCHHILL | TN |
| 2019-04-12 | 423-225-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-04-12 | 423-225-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-04-12 | 423-397-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-04-12 | 423-397-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-04-12 | 423-397-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | BENTON | TN |
| 2019-04-11 | 423-621-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | TN |
| 2019-04-11 | 423-621-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | MORRISTOWN | 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.