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
2012-02-14 951-335-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2012-02-01 951-356-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2012-01-24 951-337-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D MORENO CA
2012-01-24 951-338-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMSCL CNY CA
2011-12-28 951-331-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2011-12-28 951-331-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2011-12-19 951-322-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2011-12-16 951-723-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SUN CITY CA
2011-12-16 951-916-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LAKEVIEWNU CA
2011-12-14 951-291-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ELSINORE CA
2011-12-13 951-292-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2011-12-13 951-335-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2011-12-13 951-335-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2011-12-13 951-356-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CORONA CA
2011-12-13 951-665-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2011-12-06 951-322-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2011-12-06 951-322-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2011-11-30 951-335-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2011-11-30 951-373-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARLINGTON CA
2011-11-28 951-846-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2011-11-22 951-337-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D MORENO CA
2011-11-01 951-373-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 ARLINGTON CA
2011-10-27 951-221-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2011-10-18 951-356-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONA CA
2011-10-18 951-703-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MIRA LOMA CA
2011-10-12 951-322-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2011-10-12 951-322-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2011-10-12 951-322-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2011-09-28 951-373-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2011-09-19 951-292-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D HEMT SNJC CA
2011-09-19 951-373-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ARLINGTON CA
2011-09-13 951-305-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2011-09-13 951-305-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2011-09-13 951-331-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEMECULA CA
2011-09-06 951-337-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2011-09-02 951-292-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HEMT SNJC CA
2011-08-23 951-358-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2011-08-22 951-999-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2011-08-19 951-299-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C ARLINGTON CA
2011-08-12 951-322-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2011-08-11 951-335-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RIVERSIDE CA
2011-08-09 951-373-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARLINGTON CA
2011-08-05 951-291-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSINORE CA
2011-08-05 951-703-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MIRA LOMA CA
2011-08-03 951-638-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TEMSCL CNY CA
2011-08-03 951-916-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LAKEVIEWNU CA
2011-08-02 951-356-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CORONA CA
2011-07-28 951-223-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT HMLD CA
2011-07-25 951-335-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE CA
2011-07-22 951-324-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON 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.