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 |
|---|---|---|---|---|---|---|---|
| 2011-04-28 | 831-296-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2011-04-22 | 831-783-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2011-03-31 | 831-325-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2011-03-31 | 831-515-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2011-03-22 | 831-288-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2011-03-15 | 831-854-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2011-03-02 | 831-222-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FELTON | CA |
| 2011-03-02 | 831-288-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2011-03-02 | 831-607-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2011-02-18 | 831-205-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | HOLLISTER | CA |
| 2011-01-25 | 831-453-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CASTROVL | CA |
| 2011-01-14 | 831-661-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | APTOS | CA |
| 2011-01-11 | 831-821-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | TRES PINOS | CA |
| 2010-11-22 | 831-288-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2010-11-22 | 831-295-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2010-11-22 | 831-512-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-11-05 | 831-776-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-11-03 | 831-732-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SAN ARDO | CA |
| 2010-10-27 | 831-205-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | HOLLISTER | CA |
| 2010-10-26 | 831-856-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GREENFIELD | CA |
| 2010-10-14 | 831-442-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-10-04 | 831-287-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-10-04 | 831-824-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2010-09-24 | 831-204-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2010-09-22 | 831-406-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2010-09-16 | 831-204-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2010-09-02 | 831-287-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-09-01 | 831-223-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | SOLEDAD | CA |
| 2010-08-31 | 831-350-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | TRES PINOS | CA |
| 2010-08-30 | 831-204-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2010-08-25 | 831-216-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FELTON | CA |
| 2010-08-17 | 831-731-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASTROVL | CA |
| 2010-08-12 | 831-613-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2010-08-12 | 831-621-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2010-08-10 | 831-288-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2010-08-10 | 831-295-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2010-08-10 | 831-607-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2010-08-09 | 831-295-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SANTA CRUZ | CA |
| 2010-08-06 | 831-431-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SANTA CRUZ | CA |
| 2010-08-06 | 831-431-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2010-08-03 | 831-221-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SAN ARDO | CA |
| 2010-08-03 | 831-288-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2010-08-03 | 831-350-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | TRES PINOS | CA |
| 2010-08-03 | 831-382-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SAN LUCAS | CA |
| 2010-08-03 | 831-586-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SAN JUAN | CA |
| 2010-08-02 | 831-290-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | GONZALES | CA |
| 2010-07-30 | 831-217-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BOULDERCRK | CA |
| 2010-07-30 | 831-218-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BEN LOMOND | CA |
| 2010-07-30 | 831-232-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CHUALAR | CA |
| 2010-07-30 | 831-298-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | 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.