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 |
|---|---|---|---|---|---|---|---|
| 2008-08-07 | 831-713-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2008-08-05 | 831-708-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | APTOS | CA |
| 2008-08-04 | 831-975-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SALINAS | CA |
| 2008-07-29 | 831-786-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2008-07-23 | 831-269-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-07-16 | 831-713-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SANTA CRUZ | CA |
| 2008-07-01 | 831-854-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2008-06-26 | 831-293-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| 2008-06-24 | 831-435-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2008-06-06 | 831-477-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2008-06-04 | 831-710-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2008-05-30 | 831-269-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-05-30 | 831-740-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2008-05-13 | 831-585-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2008-05-07 | 831-216-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FELTON | CA |
| 2008-05-07 | 831-269-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2008-05-07 | 831-272-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SALINAS | CA |
| 2008-05-07 | 831-574-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CARMEL | CA |
| 2008-05-06 | 831-218-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BEN LOMOND | CA |
| 2008-05-06 | 831-664-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | HOLLISTER | CA |
| 2008-05-06 | 831-740-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2008-04-28 | 831-498-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2008-04-04 | 831-383-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | MONTEREY | CA |
| 2008-04-03 | 831-265-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HOLLISTER | CA |
| 2008-04-01 | 831-664-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | HOLLISTER | CA |
| 2008-03-18 | 831-731-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CASTROVL | CA |
| 2008-03-10 | 831-707-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2008-03-07 | 831-207-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | HOLLISTER | CA |
| 2008-03-07 | 831-269-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2008-03-07 | 831-704-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | FELTON | CA |
| 2008-03-04 | 831-325-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2008-02-22 | 831-324-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2008-02-15 | 831-741-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASTROVL | CA |
| 2008-02-08 | 831-512-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2008-02-05 | 831-233-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2008-01-23 | 831-920-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2008-01-22 | 831-219-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | APTOS | CA |
| 2008-01-03 | 831-869-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | MONTEREY | CA |
| 2007-12-07 | 831-756-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2007-11-13 | 831-706-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2007-11-13 | 831-706-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2007-11-06 | 831-902-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | HOLLISTER | CA |
| 2007-11-05 | 831-998-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2007-11-05 | 831-998-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2007-11-05 | 831-998-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2007-10-29 | 831-740-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WATSONVL | CA |
| 2007-10-15 | 831-435-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2007-10-12 | 831-272-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2007-10-08 | 831-383-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2007-10-08 | 831-574-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL | 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.