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
2004-10-26 951-550-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-10-26 951-566-5XXX 5000–5999Assigned FRONTIER CALIFORNIA INC. 2319 SUN CITY CA
2004-10-26 951-813-3XXX 3000–3999Assigned FRONTIER CALIFORNIA INC. 2319 MURRIETA CA
2004-10-22 951-837-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D MURRIETA CA
2004-10-18 951-253-0XXX 0000–0999Assigned IP HORIZON LLC 515J ELSINORE CA
2004-10-18 951-253-1XXX 1000–1999Assigned IP HORIZON LLC 515J ELSINORE CA
2004-10-18 951-257-2XXX 2000–2999Assigned IP HORIZON LLC 515J IDYLLWILD CA
2004-10-18 951-257-3XXX 3000–3999Assigned IP HORIZON LLC 515J IDYLLWILD CA
2004-10-18 951-329-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2004-10-18 951-537-2XXX 2000–2999Assigned IP HORIZON LLC 515J HEMT HEMT CA
2004-10-18 951-537-3XXX 3000–3999Assigned IP HORIZON LLC 515J HEMT HEMT CA
2004-10-18 951-639-1XXX 1000–1999Assigned IP HORIZON LLC 515J SUN CITY CA
2004-10-18 951-639-2XXX 2000–2999Assigned IP HORIZON LLC 515J SUN CITY CA
2004-10-15 951-616-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2004-10-15 951-834-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MURRIETA CA
2004-10-08 951-905-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2004-09-28 951-616-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-09-23 951-252-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2004-09-23 951-442-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-09-23 951-543-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2004-09-23 951-616-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J MORENO CA
2004-09-23 951-642-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2004-09-23 951-922-4XXX 4000–4999Assigned FRONTIER CALIFORNIA INC. 2319 BANNING CA
2004-09-15 951-252-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2004-09-15 951-252-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2004-09-15 951-760-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2004-09-14 951-325-5XXX 5000–5999Assigned FRONTIER CALIFORNIA INC. 2319 HEMT HMLD CA
2004-09-13 951-760-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2004-09-13 951-760-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2004-09-10 951-638-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 TEMSCL CNY CA
2004-09-08 951-760-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2004-09-08 951-760-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2004-09-07 951-271-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2004-09-01 951-963-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2004-08-30 951-493-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORONA CA
2004-08-27 951-760-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2004-08-21 951-616-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2004-08-21 951-893-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2004-08-20 951-552-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARLINGTON CA
2004-08-20 951-750-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RIVERSIDE CA
2004-08-20 951-750-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RIVERSIDE CA
2004-08-20 951-760-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J TEMECULA CA
2004-08-16 951-490-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-08-16 951-550-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2004-08-16 951-846-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BANNING CA
2004-08-10 951-616-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-08-10 951-616-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-08-10 951-616-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2004-08-10 951-813-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MURRIETA CA
2004-08-10 951-813-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MURRIETA 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.