NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

27 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 25
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
2004-08-03 951-530-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2004-07-23 951-436-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-07-22 951-537-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J HEMT HEMT CA
2004-07-20 951-837-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2004-07-20 951-837-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2004-07-20 951-837-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRIETA CA
2004-07-19 951-492-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2004-07-19 951-492-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2004-07-19 951-492-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2004-07-16 951-834-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MURRIETA CA
2004-07-07 951-275-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2004-07-07 951-541-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2004-07-07 951-541-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2004-07-06 951-252-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2004-06-14 951-490-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-06-14 951-490-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-06-03 951-837-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J MURRIETA CA
2004-06-03 951-963-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-06-03 951-963-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-05-27 951-490-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2004-05-27 951-490-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-05-21 951-572-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 BANNING CA
2004-05-17 951-769-5XXX 5000–5999Assigned FRONTIER CALIFORNIA INC. 2319 BANNING CA
2004-05-14 951-552-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2004-05-13 951-968-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 MIRA LOMA CA
2004-05-05 951-271-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2004-05-05 951-325-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HEMT HMLD CA
2004-05-04 951-252-0XXX 0000–0999Assigned IP HORIZON LLC 515J TEMECULA CA
2004-05-04 951-252-1XXX 1000–1999Assigned IP HORIZON LLC 515J TEMECULA CA
2004-05-04 951-252-2XXX 2000–2999Assigned IP HORIZON LLC 515J TEMECULA CA
2004-04-21 951-567-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MORENO CA
2004-04-21 951-567-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MORENO CA
2004-04-19 951-567-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-04-19 951-567-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-04-15 951-490-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-04-15 951-490-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-04-15 951-566-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUN CITY CA
2004-04-15 951-566-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUN CITY CA
2004-04-15 951-707-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-04-14 951-492-7XXX 7000–7999Assigned AT&T - LOCAL 7421 HEMT HEMT CA
2004-04-13 951-776-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WOODCREST CA
2004-04-05 951-284-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONA CA
2004-04-05 951-719-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2004-03-31 951-442-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-03-31 951-442-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-03-31 951-707-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-03-31 951-707-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-03-30 951-488-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-03-30 951-488-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-03-23 951-294-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D TEMECULA 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.