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
2012-02-14 661-363-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-02-14 661-861-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-02-13 661-462-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BIG BUTTE CA
2012-02-10 661-964-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNCA NHCS CA
2012-01-26 661-800-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BKFD MAIN CA
2011-12-16 661-800-1XXX 1000–1999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2011-12-16 661-800-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2011-12-15 661-673-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA SGCC CA
2011-12-13 661-888-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNCA NHCS CA
2011-11-30 661-261-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BIG BUTTE CA
2011-11-28 661-434-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLDL PLDL CA
2011-11-22 661-434-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2011-11-08 661-282-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2011-11-08 661-382-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2011-11-08 661-382-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2011-10-26 661-673-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2011-10-26 661-673-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2011-10-12 661-709-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2011-10-12 661-754-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MOJAVE CA
2011-10-05 661-243-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2011-10-04 661-233-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2011-10-04 661-361-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2011-10-04 661-436-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2011-09-30 661-379-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2011-09-30 661-835-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD SOUTH CA
2011-09-27 661-874-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LANCASTER CA
2011-09-19 661-375-6XXX 6000–6999Assigned METROPCS, INC. 5562 DELANO CA
2011-09-14 661-380-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD MAIN CA
2011-09-14 661-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA NHCS CA
2011-09-12 661-430-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA SGCC CA
2011-08-23 661-282-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2011-08-23 661-374-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2011-08-23 661-847-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2011-08-23 661-864-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2011-08-19 661-282-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BKFD SOUTH CA
2011-08-19 661-678-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C SNCA NHCS CA
2011-08-05 661-401-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2011-08-05 661-888-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2011-08-04 661-401-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BKFD MAIN CA
2011-08-01 661-243-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD NORTH CA
2011-07-26 661-276-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C EDWARDS CA
2011-07-21 661-368-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2011-07-21 661-636-7XXX 7000–7999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2011-07-19 661-436-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2011-07-12 661-666-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2011-06-29 661-843-7XXX 7000–7999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2011-06-29 661-847-9XXX 9000–9999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD SOUTH CA
2011-06-16 661-800-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2011-06-13 661-208-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2011-06-13 661-388-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D SNCA NHCS 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.