NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

18 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 661
ONVOY, LLC - CA 10
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 3
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 2
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
2007-10-15 661-644-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2007-10-12 661-371-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2007-10-03 661-394-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2007-10-03 661-998-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2007-10-01 661-427-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2007-09-28 661-750-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J TEHACHAPI CA
2007-09-26 661-623-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TAFT CA
2007-09-25 661-414-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J SNCA NHCS CA
2007-09-24 661-526-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K PLDL PLDL CA
2007-09-24 661-526-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K PLDL PLDL CA
2007-09-24 661-526-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K PLDL PLDL CA
2007-09-18 661-369-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2007-09-18 661-369-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2007-09-18 661-369-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2007-09-18 661-369-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2007-09-18 661-718-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-09-18 661-718-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D LANCASTER CA
2007-09-18 661-718-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-09-18 661-728-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-09-18 661-728-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-09-18 661-728-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-09-13 661-979-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2007-09-07 661-206-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2007-09-07 661-206-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2007-09-07 661-206-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2007-09-05 661-343-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2007-09-05 661-621-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D SNCA SGCC CA
2007-08-28 661-557-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARVIN CA
2007-08-20 661-670-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNCA NHCS CA
2007-08-10 661-802-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2007-08-10 661-802-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2007-08-08 661-454-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DELANO CA
2007-08-08 661-630-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SHAFTER CA
2007-08-08 661-855-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ARVIN CA
2007-08-02 661-778-2XXX 2000–2999Assigned METROPCS, INC. 5562 DELANO CA
2007-08-02 661-778-4XXX 4000–4999Assigned METROPCS, INC. 5562 DELANO CA
2007-07-19 661-476-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2007-07-19 661-644-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2007-07-19 661-709-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DELANO CA
2007-07-17 661-208-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2007-07-16 661-476-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2007-07-12 661-281-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2007-07-12 661-281-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2007-07-12 661-427-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2007-07-12 661-427-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2007-07-12 661-427-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2007-07-12 661-427-8XXX 8000–8999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2007-07-12 661-427-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2007-07-12 661-974-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2007-07-12 661-974-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LANCASTER 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.