NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

16 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, 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
2010-12-03 951-999-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2010-11-24 951-290-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MURRIETA CA
2010-11-22 951-267-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2010-11-22 951-298-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-298-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2010-11-22 951-299-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON CA
2010-11-22 951-299-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON CA
2010-11-22 951-299-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-22 951-307-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2010-11-17 951-290-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2010-11-16 951-216-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TEMECULA CA
2010-11-16 951-289-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE CA
2010-11-16 951-290-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MURRIETA CA
2010-11-16 951-293-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PERRIS CA
2010-11-16 951-444-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA
2010-11-16 951-444-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA
2010-11-16 951-588-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2010-11-16 951-821-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUN CITY CA
2010-11-16 951-922-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BANNING CA
2010-11-09 951-867-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2010-11-05 951-336-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CORONA CA
2010-11-05 951-777-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RIVERSIDE CA
2010-10-27 951-444-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CORONA CA
2010-10-27 951-444-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2010-10-07 951-297-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMECULA CA
2010-10-07 951-821-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUN CITY CA
2010-10-05 951-444-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA
2010-10-05 951-708-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT SAGE CA
2010-09-27 951-268-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CORONA CA
2010-09-20 951-777-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2010-09-15 951-525-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2010-09-13 951-999-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C MORENO CA
2010-09-09 951-893-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C CORONA CA
2010-09-08 951-305-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT HEMT CA
2010-09-03 951-777-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE 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.