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 |
|---|---|---|---|---|---|---|---|
| 2021-02-08 | 423-797-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2021-02-08 | 423-797-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2021-02-08 | 423-844-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2021-02-08 | 423-845-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| 2021-02-03 | 423-726-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | MIDWAY SUL | TN |
| 2021-02-02 | 423-456-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-02-02 | 423-540-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| 2021-02-02 | 423-690-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MORRISTOWN | TN |
| 2021-02-02 | 423-818-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | JELLICO | TN |
| 2021-01-27 | 423-374-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-01-27 | 423-374-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-01-27 | 423-374-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-01-27 | 423-374-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| 2021-01-26 | 423-419-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | CUMBERLDGP | TN |
| 2021-01-26 | 423-603-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | FORK RIDGE | TN |
| 2021-01-25 | 423-897-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TN | 114F | FALLBRANCH | TN |
| 2021-01-21 | 423-766-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | LIMESTONE | TN |
| 2021-01-21 | 423-766-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | LIMESTONE | TN |
| 2021-01-18 | 423-481-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | ROAN MT | TN |
| 2021-01-18 | 423-501-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2021-01-18 | 423-501-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MOUNTAINCY | TN |
| 2021-01-18 | 423-560-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | ERWIN | TN |
| 2021-01-18 | 423-560-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | ERWIN | TN |
| 2021-01-18 | 423-583-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | TN |
| 2021-01-18 | 423-583-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | SULIVNGDNS | TN |
| 2021-01-18 | 423-657-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TN | 525E | MOSHEIM | TN |
| 2021-01-18 | 423-657-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MOSHEIM | TN |
| 2021-01-18 | 423-662-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| 2021-01-18 | 423-662-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | BLOUNTVL | TN |
| 2021-01-18 | 423-726-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2021-01-18 | 423-726-5XXX | 5000–5999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2021-01-18 | 423-726-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | MIDWAY SUL | TN |
| 2021-01-18 | 423-873-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TN | 525E | STONEY CRK | TN |
| 2021-01-18 | 423-873-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TN | 525E | STONEY CRK | TN |
| 2021-01-18 | 423-922-3XXX | 3000–3999 | Assigned | ONVOY, LLC - TN | 525E | BAILEYTON | TN |
| 2021-01-18 | 423-922-4XXX | 4000–4999 | Assigned | ONVOY, LLC - TN | 525E | BAILEYTON | TN |
| 2021-01-12 | 423-656-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | JOHNSON CY | TN |
| 2021-01-11 | 423-220-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - TN | 124F | ERWIN | TN |
| 2021-01-05 | 423-732-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2020-12-30 | 423-407-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | SPRINGCITY | TN |
| 2020-12-30 | 423-419-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | CUMBERLDGP | TN |
| 2020-12-30 | 423-481-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | ROAN MT | TN |
| 2020-12-30 | 423-501-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | MOUNTAINCY | TN |
| 2020-12-30 | 423-515-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | SO PITTSBG | TN |
| 2020-12-30 | 423-560-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | ERWIN | TN |
| 2020-12-30 | 423-565-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | DECATUR | TN |
| 2020-12-30 | 423-567-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | DAYTON | TN |
| 2020-12-30 | 423-583-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | SULIVNGDNS | TN |
| 2020-12-30 | 423-589-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | GEORGETOWN | TN |
| 2020-12-30 | 423-603-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | FORK RIDGE | 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.