NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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, all time — NPA 831
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-09-30 | 831-652-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL VLY | CA |
| 2014-04-18 | 831-296-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2014-03-19 | 831-732-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SAN ARDO | CA |
| 2014-03-13 | 831-465-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2013-10-11 | 831-920-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2012-08-03 | 831-316-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2012-06-28 | 831-222-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FELTON | CA |
| 2012-06-28 | 831-316-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2012-02-15 | 831-237-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SOLEDAD | CA |
| 2012-02-15 | 831-525-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | KING CITY | CA |
| 2012-02-10 | 831-824-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2011-12-15 | 831-665-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | HOLLISTER | CA |
| 2011-12-15 | 831-741-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CASTROVL | CA |
| 2011-12-15 | 831-856-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | GREENFIELD | CA |
| 2011-12-15 | 831-920-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2011-12-07 | 831-574-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| 2011-11-30 | 831-975-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2011-11-11 | 831-684-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | APTOS | CA |
| 2011-05-26 | 831-296-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2010-11-22 | 831-288-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2010-10-27 | 831-205-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | HOLLISTER | CA |
| 2010-09-24 | 831-204-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2010-08-12 | 831-621-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2010-05-24 | 831-250-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| 2010-01-19 | 831-920-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MONTEREY | CA |
| 2009-09-04 | 831-272-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | 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 |
| 2008-09-09 | 831-269-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2008-06-26 | 831-293-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | 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 |
| 2008-05-06 | 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 |
| 2008-03-04 | 831-325-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | 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 |
| 2007-10-02 | 831-350-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | TRES PINOS | CA |
| 2007-06-08 | 831-240-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SALINAS | CA |
| 2006-06-22 | 831-824-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2006-05-17 | 831-274-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2006-05-11 | 831-350-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | TRES PINOS | CA |
| 2006-02-02 | 831-740-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2005-12-29 | 831-440-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-12-29 | 831-440-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-12-29 | 831-440-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-11-22 | 831-216-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FELTON | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.