NumberResearchRecent thousands-block assignments
0 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, all time — NPA 831
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-04-27 | 831-260-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SOLEDAD | CA |
| 2022-04-12 | 831-837-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2022-04-12 | 831-946-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SANTA CRUZ | CA |
| 2019-09-13 | 831-580-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | GONZALES | CA |
| 2019-07-22 | 831-430-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SANTA CRUZ | CA |
| 2019-05-01 | 831-643-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MONTEREY | CA |
| 2019-03-05 | 831-202-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2019-01-16 | 831-387-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | KING CITY | CA |
| 2017-09-25 | 831-500-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2016-05-19 | 831-264-9XXX | 9000–9999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MONTEREY | CA |
| 2016-04-15 | 831-315-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SOLEDAD | CA |
| 2015-03-30 | 831-740-0XXX | 0000–0999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | WATSONVL | CA |
| 2014-10-20 | 831-856-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | GREENFIELD | CA |
| 2014-09-03 | 831-296-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2011-07-13 | 831-676-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2011-07-01 | 831-264-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MONTEREY | CA |
| 2010-04-26 | 831-293-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CARMEL | CA |
| 2009-11-10 | 831-824-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SANTA CRUZ | CA |
| 2009-10-09 | 831-205-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | HOLLISTER | CA |
| 2008-03-18 | 831-731-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CASTROVL | CA |
| 2007-07-10 | 831-264-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MONTEREY | CA |
| 2007-06-21 | 831-269-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2005-11-01 | 831-460-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 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.