NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 951
UTILITY TELECOM GROUP, LLC - CA 32
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2021-03-10 951-569-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MORENO CA
2017-12-22 951-362-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MIRA LOMA CA
2017-12-11 951-671-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-362-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MIRA LOMA CA
2017-11-30 951-362-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MIRA LOMA CA
2017-11-30 951-671-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2017-11-30 951-671-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2012-07-26 951-309-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SUN CITY CA
2011-09-13 951-331-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEMECULA CA
2006-06-13 951-790-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MIRA LOMA CA
2006-05-12 951-260-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HEMT HEMT CA
2006-05-12 951-385-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 PERRIS CA
2006-05-12 951-487-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HEMT SNJC CA
2006-05-12 951-527-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 IDYLLWILD CA
2006-05-12 951-579-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ELSINORE CA
2006-05-12 951-582-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CORONA CA
2006-05-12 951-638-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEMSCL CNY CA
2006-05-12 951-691-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MURRIETA CA
2006-05-12 951-729-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ARLINGTON CA
2006-05-12 951-744-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HEMT ANZA CA
2006-05-12 951-767-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HEMT SAGE CA
2006-05-12 951-824-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 RIVERSIDE CA
2006-05-12 951-846-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BANNING CA
2006-05-12 951-928-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LAKEVIEWNU CA
2005-12-20 951-527-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 IDYLLWILD CA
2005-10-07 951-527-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 IDYLLWILD 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.