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 |
|---|---|---|---|---|---|---|---|
| 2022-09-20 | 831-289-3XXX | 3000–3999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | BEN LOMOND | CA |
| 2022-09-19 | 831-833-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2022-09-16 | 831-833-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2022-09-16 | 831-833-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2022-09-08 | 831-388-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2022-09-08 | 831-388-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2022-09-08 | 831-388-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2022-08-24 | 831-788-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | SALINAS | CA |
| 2022-08-24 | 831-788-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | SALINAS | CA |
| 2022-08-16 | 831-587-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2022-08-02 | 831-587-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2022-08-02 | 831-587-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2022-08-02 | 831-587-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2022-07-27 | 831-788-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2022-07-27 | 831-788-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2022-07-27 | 831-837-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2022-07-27 | 831-837-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2022-07-27 | 831-837-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2022-07-25 | 831-260-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | CA |
| 2022-07-25 | 831-580-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | GONZALES | CA |
| 2022-07-25 | 831-580-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | GONZALES | CA |
| 2022-07-25 | 831-580-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | GONZALES | CA |
| 2022-07-08 | 831-305-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GONZALES | CA |
| 2022-07-05 | 831-586-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SAN JUAN | CA |
| 2022-06-22 | 831-244-5XXX | 5000–5999 | Assigned | COMMIO, LLC | 939H | BIG SUR | CA |
| 2022-06-22 | 831-260-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | SOLEDAD | CA |
| 2022-06-22 | 831-309-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | CARMEL | CA |
| 2022-06-10 | 831-259-7XXX | 7000–7999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | MONTEREY | CA |
| 2022-06-10 | 831-259-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | MONTEREY | CA |
| 2022-06-10 | 831-270-4XXX | 4000–4999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALINAS | CA |
| 2022-06-10 | 831-270-7XXX | 7000–7999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALINAS | CA |
| 2022-06-10 | 831-580-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | GONZALES | CA |
| 2022-06-09 | 831-215-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | MONTEREY | CA |
| 2022-06-09 | 831-308-9XXX | 9000–9999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL VLY | CA |
| 2022-06-09 | 831-309-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2022-06-09 | 831-309-8XXX | 8000–8999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2022-06-03 | 831-744-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | GONZALES | CA |
| 2022-05-31 | 831-215-1XXX | 1000–1999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2022-05-31 | 831-215-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2022-05-31 | 831-788-8XXX | 8000–8999 | Assigned | FRACTEL, LLC | 965H | SALINAS | CA |
| 2022-04-27 | 831-260-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SOLEDAD | CA |
| 2022-04-13 | 831-282-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2022-04-13 | 831-282-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2022-04-13 | 831-282-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2022-04-13 | 831-282-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2022-04-13 | 831-282-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2022-04-12 | 831-265-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2022-04-12 | 831-271-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2022-04-12 | 831-271-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | HOLLISTER | CA |
| 2022-04-12 | 831-308-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL VLY | 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.