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 |
|---|---|---|---|---|---|---|---|
| 2009-09-10 | 831-713-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2009-09-08 | 831-263-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | KING CITY | CA |
| 2009-09-04 | 831-272-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2009-08-31 | 831-427-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANTA CRUZ | CA |
| 2009-08-05 | 831-756-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-07-28 | 831-498-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2009-07-21 | 831-293-8XXX | 8000–8999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2009-06-22 | 831-265-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | HOLLISTER | CA |
| 2009-06-22 | 831-466-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2009-06-22 | 831-756-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-06-16 | 831-219-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | APTOS | CA |
| 2009-06-16 | 831-593-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SAN JUAN | CA |
| 2009-06-16 | 831-854-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SANTA CRUZ | CA |
| 2009-06-15 | 831-313-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HOLLISTER | CA |
| 2009-06-12 | 831-242-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | MONTEREY | CA |
| 2009-06-12 | 831-242-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | MONTEREY | CA |
| 2009-06-11 | 831-288-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WATSONVL | CA |
| 2009-06-11 | 831-431-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2009-06-05 | 831-241-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2009-06-04 | 831-607-3XXX | 3000–3999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | APTOS | CA |
| 2009-06-02 | 831-525-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | KING CITY | CA |
| 2009-05-18 | 831-710-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-04-30 | 831-975-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SALINAS | CA |
| 2009-04-29 | 831-756-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-04-22 | 831-498-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2009-03-12 | 831-269-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-03-11 | 831-740-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2009-03-09 | 831-661-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | APTOS | CA |
| 2009-03-02 | 831-204-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2009-03-02 | 831-250-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL | CA |
| 2009-03-02 | 831-393-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2008-12-17 | 831-406-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2008-12-17 | 831-704-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FELTON | CA |
| 2008-12-17 | 831-708-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2008-12-17 | 831-824-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2008-12-01 | 831-223-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | SOLEDAD | CA |
| 2008-12-01 | 831-613-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2008-12-01 | 831-740-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2008-11-26 | 831-717-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2008-11-21 | 831-664-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | HOLLISTER | CA |
| 2008-11-21 | 831-747-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | MONTEREY | CA |
| 2008-11-13 | 831-269-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-11-13 | 831-269-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-10-23 | 831-275-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2008-09-17 | 831-789-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALINAS | CA |
| 2008-09-16 | 831-269-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-09-09 | 831-269-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2008-08-22 | 831-539-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2008-08-12 | 831-774-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | GONZALES | CA |
| 2008-08-07 | 831-706-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | 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.