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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-06-28 | 831-889-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANTA CRUZ | CA |
| 2017-12-06 | 831-572-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2017-11-30 | 831-572-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2017-11-30 | 831-572-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2017-11-30 | 831-572-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2017-11-30 | 831-572-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2017-11-30 | 831-572-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2016-01-22 | 831-888-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANTA CRUZ | CA |
| 2016-01-22 | 831-888-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANTA CRUZ | CA |
| 2015-04-03 | 831-948-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-8XXX | 8000–8999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2015-04-03 | 831-948-9XXX | 9000–9999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2010-07-26 | 831-387-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | KING CITY | CA |
| 2006-06-02 | 831-222-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | FELTON | CA |
| 2006-06-02 | 831-223-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SOLEDAD | CA |
| 2006-06-02 | 831-336-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BEN LOMOND | CA |
| 2006-06-02 | 831-337-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BOULDERCRK | CA |
| 2006-06-02 | 831-382-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SAN LUCAS | CA |
| 2006-06-02 | 831-435-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SANTA CRUZ | CA |
| 2006-06-02 | 831-613-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | GREENFIELD | CA |
| 2006-06-02 | 831-623-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SAN JUAN | CA |
| 2006-06-02 | 831-627-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SAN ARDO | CA |
| 2006-06-02 | 831-632-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CASTROVL | CA |
| 2006-06-02 | 831-679-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CHUALAR | CA |
| 2006-06-02 | 831-687-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | APTOS | CA |
| 2006-06-02 | 831-740-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | WATSONVL | CA |
| 2006-06-02 | 831-744-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | GONZALES | CA |
| 2006-05-04 | 831-630-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | HOLLISTER | CA |
| 2006-03-14 | 831-620-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CARMEL | CA |
| 2006-03-14 | 831-652-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CARMEL VLY | CA |
| 2006-03-14 | 831-667-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BIG SUR | CA |
| 2006-02-17 | 831-383-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MONTEREY | CA |
| 2005-09-14 | 831-756-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SALINAS | 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.