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
2012-07-11 661-377-4XXX 4000–4999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-07-11 661-377-5XXX 5000–5999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-07-11 661-377-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-07-11 661-748-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2012-07-10 661-221-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MOJAVE CA
2012-06-27 661-390-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2012-06-27 661-748-1XXX 1000–1999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2012-06-13 661-418-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2012-06-07 661-434-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2012-06-07 661-434-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2012-06-07 661-434-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2012-05-30 661-375-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 DELANO CA
2012-05-30 661-375-2XXX 2000–2999Assigned METROPCS, INC. 5562 DELANO CA
2012-05-30 661-418-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2012-05-25 661-282-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2012-05-25 661-381-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2012-05-25 661-529-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BKFD SOUTH CA
2012-05-25 661-529-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C BKFD SOUTH CA
2012-05-24 661-336-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2012-05-24 661-864-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2012-05-22 661-422-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLDL LNVY CA
2012-05-17 661-375-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DELANO CA
2012-05-17 661-375-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DELANO CA
2012-05-09 661-370-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2012-04-27 661-843-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD MAIN CA
2012-04-20 661-401-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2012-04-20 661-859-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-04-06 661-666-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2012-04-06 661-792-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MCFARLAND CA
2012-03-28 661-666-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2012-03-28 661-666-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2012-03-22 661-927-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MCFARLAND CA
2012-03-21 661-283-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2012-03-21 661-367-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D SNCA SGCC CA
2012-03-21 661-418-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LANCASTER CA
2012-03-21 661-434-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLDL PLDL CA
2012-03-14 661-418-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2012-03-12 661-360-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K SNCA SGCC CA
2012-03-08 661-418-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2012-03-08 661-418-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2012-03-06 661-382-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K PLDL PLDL CA
2012-02-27 661-418-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2012-02-27 661-418-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2012-02-21 661-772-3XXX 3000–3999Assigned METROPCS, INC. 5562 WASCO CA
2012-02-17 661-281-7XXX 7000–7999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-02-17 661-800-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2012-02-17 661-800-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2012-02-15 661-371-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD MAIN CA
2012-02-15 661-665-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2012-02-15 661-874-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 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.