NumberResearchRecent thousands-block assignments
13 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 |
|---|---|---|---|---|---|---|---|
| 2024-11-20 | 831-760-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-20 | 831-886-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-20 | 831-886-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-20 | 831-886-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-20 | 831-887-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-20 | 831-887-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-11-12 | 831-632-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | CASTROVL | CA |
| 2024-10-22 | 831-808-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SOLEDAD | CA |
| 2024-10-14 | 831-392-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MONTEREY | CA |
| 2024-10-14 | 831-887-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2024-10-09 | 831-330-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | CARMEL | CA |
| 2024-10-09 | 831-859-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2024-10-09 | 831-859-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2024-10-08 | 831-778-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN LUCAS | CA |
| 2024-10-02 | 831-317-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MONTEREY | CA |
| 2024-10-02 | 831-317-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MONTEREY | CA |
| 2024-10-02 | 831-317-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MONTEREY | CA |
| 2024-10-02 | 831-317-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MONTEREY | CA |
| 2024-10-02 | 831-867-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MONTEREY | CA |
| 2024-09-23 | 831-317-0XXX | 0000–0999 | Assigned | LEAP TELECOM, LLC | 616J | MONTEREY | CA |
| 2024-09-16 | 831-284-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2024-09-11 | 831-532-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BEN LOMOND | CA |
| 2024-09-06 | 831-808-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | CA |
| 2024-08-28 | 831-859-0XXX | 0000–0999 | Assigned | NUSO, LLC | 732J | SALINAS | CA |
| 2024-08-28 | 831-859-1XXX | 1000–1999 | Assigned | NUSO, LLC | 732J | SALINAS | CA |
| 2024-08-19 | 831-312-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MONTEREY | CA |
| 2024-08-19 | 831-859-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2024-08-19 | 831-859-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2024-08-12 | 831-366-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BOULDERCRK | CA |
| 2024-07-30 | 831-859-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2024-07-30 | 831-859-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2024-07-29 | 831-665-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2024-07-22 | 831-268-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | FELTON | CA |
| 2024-07-22 | 831-289-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BEN LOMOND | CA |
| 2024-07-22 | 831-366-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BOULDERCRK | CA |
| 2024-07-22 | 831-529-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SANTA CRUZ | CA |
| 2024-07-22 | 831-536-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WATSONVL | CA |
| 2024-07-22 | 831-842-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | APTOS | CA |
| 2024-07-03 | 831-286-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2024-07-03 | 831-537-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2024-07-03 | 831-664-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2024-07-03 | 831-808-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SOLEDAD | CA |
| 2024-06-24 | 831-732-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SAN ARDO | CA |
| 2024-06-21 | 831-312-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2024-06-21 | 831-312-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MONTEREY | CA |
| 2024-06-21 | 831-312-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MONTEREY | CA |
| 2024-06-21 | 831-330-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL | CA |
| 2024-06-20 | 831-859-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | SALINAS | CA |
| 2024-06-20 | 831-859-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | SALINAS | CA |
| 2024-06-17 | 831-673-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HOLLISTER | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.