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 |
|---|---|---|---|---|---|---|---|
| 2016-06-23 | 831-789-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2016-06-23 | 831-999-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2016-06-22 | 831-512-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2016-06-22 | 831-574-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | CARMEL | CA |
| 2016-06-22 | 831-999-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-06-22 | 831-999-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-06-20 | 831-256-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2016-06-20 | 831-287-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2016-06-20 | 831-484-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2016-06-15 | 831-297-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | HOLLISTER | CA |
| 2016-06-10 | 831-322-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-06-07 | 831-313-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2016-05-26 | 831-999-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2016-05-20 | 831-256-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2016-05-20 | 831-999-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-20 | 831-999-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-20 | 831-999-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-19 | 831-264-9XXX | 9000–9999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MONTEREY | CA |
| 2016-05-16 | 831-777-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-16 | 831-777-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-11 | 831-318-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2016-05-11 | 831-318-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2016-05-06 | 831-225-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2016-05-06 | 831-225-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2016-05-06 | 831-900-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-05-06 | 831-900-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-04-18 | 831-324-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MONTEREY | CA |
| 2016-04-15 | 831-315-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SOLEDAD | CA |
| 2016-04-14 | 831-218-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2016-04-14 | 831-218-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2016-04-14 | 831-337-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2016-04-14 | 831-337-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2016-04-14 | 831-999-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-04-14 | 831-999-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2016-04-12 | 831-318-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2016-04-12 | 831-318-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2016-04-12 | 831-609-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BEN LOMOND | CA |
| 2016-04-11 | 831-610-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BOULDERCRK | CA |
| 2016-04-07 | 831-999-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SANTA CRUZ | CA |
| 2016-04-05 | 831-225-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2016-04-05 | 831-322-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-04-05 | 831-322-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2016-04-05 | 831-673-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HOLLISTER | CA |
| 2016-03-30 | 831-322-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2016-03-24 | 831-218-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2016-03-24 | 831-278-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2016-03-24 | 831-278-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2016-03-24 | 831-703-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2016-03-24 | 831-703-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2016-03-18 | 831-318-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | 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.