NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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, last 30 days — NPA 951
ONVOY, LLC - CA 14
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 1
BANDWIDTH.COM CLEC, LLC - CA 1
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
2014-09-17 951-423-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2014-09-16 951-639-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUN CITY CA
2014-09-15 951-386-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C WOODCREST CA
2014-09-15 951-386-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C WOODCREST CA
2014-09-11 951-395-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2014-09-09 951-390-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2014-09-09 951-390-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2014-09-03 951-397-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2014-08-29 951-350-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2014-08-29 951-379-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MORENO CA
2014-08-29 951-399-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D ELSINORE CA
2014-08-27 951-396-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2014-08-27 951-396-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2014-08-26 951-332-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C MIRA LOMA CA
2014-08-26 951-379-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MORENO CA
2014-08-26 951-379-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C MORENO CA
2014-08-26 951-903-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C MIRA LOMA CA
2014-08-25 951-390-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT HEMT CA
2014-08-22 951-396-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2014-08-22 951-399-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSINORE CA
2014-08-22 951-399-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSINORE CA
2014-08-14 951-394-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2014-08-12 951-379-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MORENO CA
2014-08-07 951-395-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2014-08-07 951-423-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2014-08-06 951-394-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C RIVERSIDE CA
2014-07-30 951-387-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2014-07-29 951-387-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2014-07-29 951-387-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2014-07-23 951-380-3XXX 3000–3999Assigned HD CARRIER LLC 321J HEMT HEMT CA
2014-07-23 951-387-7XXX 7000–7999Assigned HD CARRIER LLC 321J MURRIETA CA
2014-07-23 951-395-7XXX 7000–7999Assigned HD CARRIER LLC 321J TEMECULA CA
2014-07-23 951-423-3XXX 3000–3999Assigned HD CARRIER LLC 321J PERRIS CA
2014-07-23 951-999-6XXX 6000–6999Assigned HD CARRIER LLC 321J MORENO CA
2014-07-17 951-380-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2014-07-10 951-395-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2014-07-09 951-432-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CORONA CA
2014-07-08 951-423-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PERRIS CA
2014-06-20 951-370-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUN CITY CA
2014-06-20 951-387-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2014-06-18 951-396-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ARLINGTON CA
2014-06-17 951-744-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT ANZA CA
2014-06-16 951-366-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAKEVIEWNU CA
2014-06-16 951-370-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUN CITY CA
2014-06-16 951-370-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUN CITY CA
2014-06-16 951-370-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SUN CITY CA
2014-06-16 951-382-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TEMSCL CNY CA
2014-06-16 951-388-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HEMT HMLD CA
2014-06-16 951-399-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELSINORE CA
2014-06-10 951-379-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MORENO CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.