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
2016-06-23 951-405-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE CA
2016-06-23 951-406-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2016-06-22 951-407-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA
2016-06-22 951-412-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C MURRIETA CA
2016-06-22 951-412-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MURRIETA CA
2016-06-22 951-421-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MORENO CA
2016-06-20 951-404-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K TEMECULA CA
2016-06-20 951-407-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K CORONA CA
2016-06-20 951-430-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K SUN CITY CA
2016-06-20 951-455-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MORENO CA
2016-06-20 951-483-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2016-06-15 951-476-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2016-06-14 951-381-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BANNING CA
2016-06-14 951-391-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K HEMT HEMT CA
2016-06-14 951-455-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MORENO CA
2016-06-14 951-455-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MORENO CA
2016-06-10 951-412-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2016-06-08 951-483-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PERRIS CA
2016-06-07 951-429-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WOODCREST CA
2016-05-27 951-430-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUN CITY CA
2016-05-19 951-981-1XXX 1000–1999Assigned HD CARRIER LLC 321J LAKEVIEWNU CA
2016-05-19 951-981-7XXX 7000–7999Assigned HD CARRIER LLC 321J LAKEVIEWNU CA
2016-05-19 951-981-8XXX 8000–8999Assigned HD CARRIER LLC 321J LAKEVIEWNU CA
2016-05-19 951-981-9XXX 9000–9999Assigned HD CARRIER LLC 321J LAKEVIEWNU CA
2016-05-17 951-405-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 RIVERSIDE CA
2016-05-17 951-412-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K MURRIETA CA
2016-05-16 951-455-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K MORENO CA
2016-05-11 951-458-9XXX 9000–9999Assigned MCC TELEPHONY OF THE WEST, LLC - CA 857F SUN CITY CA
2016-05-04 951-457-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K ELSINORE CA
2016-05-02 951-381-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K BANNING CA
2016-05-02 951-381-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2016-04-29 951-457-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J ELSINORE CA
2016-04-26 951-404-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K TEMECULA CA
2016-04-26 951-422-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2016-04-25 951-438-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2016-04-25 951-438-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2016-04-25 951-474-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEMT SNJC CA
2016-04-21 951-458-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K SUN CITY CA
2016-04-15 951-404-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2016-04-12 951-404-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2016-04-12 951-404-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2016-04-12 951-476-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARLINGTON CA
2016-04-11 951-404-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C TEMECULA CA
2016-04-11 951-420-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K PERRIS CA
2016-04-05 951-467-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HMLD CA
2016-04-05 951-467-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HMLD CA
2016-04-05 951-467-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HMLD CA
2016-03-28 951-407-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CORONA CA
2016-03-23 951-401-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C TEMECULA CA
2016-03-23 951-476-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C ARLINGTON 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.