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 831
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 |
|---|---|---|---|---|---|---|---|
| 2016-09-16 | 831-353-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-09-16 | 831-353-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-09-15 | 831-201-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2016-09-15 | 831-353-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2016-09-15 | 831-888-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SANTA CRUZ | CA |
| 2016-09-14 | 831-201-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-09-14 | 831-201-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-09-07 | 831-201-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2016-09-01 | 831-200-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2016-08-30 | 831-353-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | WATSONVL | CA |
| 2016-08-30 | 831-900-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SANTA CRUZ | CA |
| 2016-08-26 | 831-241-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | MONTEREY | CA |
| 2016-08-26 | 831-628-8XXX | 8000–8999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TRES PINOS | CA |
| 2016-08-17 | 831-268-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | FELTON | CA |
| 2016-08-17 | 831-278-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BEN LOMOND | CA |
| 2016-08-17 | 831-318-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | APTOS | CA |
| 2016-08-17 | 831-318-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | APTOS | CA |
| 2016-08-17 | 831-353-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WATSONVL | CA |
| 2016-08-17 | 831-533-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BOULDERCRK | CA |
| 2016-08-17 | 831-900-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SANTA CRUZ | CA |
| 2016-08-09 | 831-258-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2016-08-09 | 831-258-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2016-08-09 | 831-900-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2016-07-20 | 831-583-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2016-07-20 | 831-583-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2016-07-19 | 831-353-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-07-19 | 831-353-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-07-19 | 831-353-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-07-19 | 831-353-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-07-15 | 831-258-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2016-07-15 | 831-268-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2016-07-15 | 831-268-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2016-07-15 | 831-268-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2016-07-15 | 831-268-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2016-07-12 | 831-900-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-07-12 | 831-900-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-07-12 | 831-900-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-07-12 | 831-900-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-07-12 | 831-900-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-07-08 | 831-258-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2016-07-06 | 831-318-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2016-07-06 | 831-318-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2016-07-06 | 831-318-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2016-07-05 | 831-322-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2016-06-28 | 831-200-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2016-06-28 | 831-200-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2016-06-28 | 831-322-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2016-06-24 | 831-322-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2016-06-23 | 831-225-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2016-06-23 | 831-225-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
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.