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 |
|---|---|---|---|---|---|---|---|
| 2010-07-30 | 831-531-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2010-07-30 | 831-632-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CASTROVL | CA |
| 2010-07-26 | 831-204-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2010-07-26 | 831-387-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | KING CITY | CA |
| 2010-07-16 | 831-244-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BIG SUR | CA |
| 2010-07-15 | 831-272-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-07-13 | 831-205-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HOLLISTER | CA |
| 2010-07-09 | 831-324-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2010-07-01 | 831-288-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | CA |
| 2010-06-10 | 831-756-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-06-08 | 831-204-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2010-06-08 | 831-223-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SOLEDAD | CA |
| 2010-06-08 | 831-238-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CARMEL | CA |
| 2010-06-08 | 831-287-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-06-08 | 831-287-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-06-08 | 831-471-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2010-06-08 | 831-525-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | KING CITY | CA |
| 2010-06-08 | 831-613-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | GREENFIELD | CA |
| 2010-05-26 | 831-272-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-05-24 | 831-250-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| 2010-04-26 | 831-293-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CARMEL | CA |
| 2010-04-23 | 831-609-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | BEN LOMOND | CA |
| 2010-04-23 | 831-703-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | BOULDERCRK | CA |
| 2010-04-20 | 831-272-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-04-20 | 831-272-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2010-03-23 | 831-288-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | WATSONVL | CA |
| 2010-03-03 | 831-272-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-02-10 | 831-204-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | MONTEREY | CA |
| 2010-02-10 | 831-205-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HOLLISTER | CA |
| 2010-02-09 | 831-272-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2010-02-04 | 831-747-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MONTEREY | CA |
| 2010-02-03 | 831-216-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FELTON | CA |
| 2010-01-28 | 831-515-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2010-01-28 | 831-531-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2010-01-19 | 831-920-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2010-01-18 | 831-709-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | BEN LOMOND | CA |
| 2009-12-14 | 831-249-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BIG SUR | CA |
| 2009-12-07 | 831-540-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-11-24 | 831-288-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2009-11-23 | 831-706-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2009-11-19 | 831-216-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2009-11-18 | 831-217-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2009-11-18 | 831-709-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2009-11-13 | 831-689-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2009-11-10 | 831-824-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SANTA CRUZ | CA |
| 2009-11-04 | 831-264-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2009-10-28 | 831-515-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2009-10-09 | 831-205-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | HOLLISTER | CA |
| 2009-10-02 | 831-756-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2009-09-21 | 831-218-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | 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.