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
2004-10-07 661-916-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2004-10-04 661-444-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2004-09-16 661-340-7XXX 7000–7999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-09-16 661-974-8XXX 8000–8999Assigned PACIFIC BELL (COMPETITIVE) 7480 LANCASTER CA
2004-09-14 661-477-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2004-09-14 661-477-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2004-09-14 661-565-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2004-09-14 661-565-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2004-09-07 661-231-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LEBEC CA
2004-08-19 661-213-3XXX 3000–3999Assigned PACIFIC BELL 9740 BKFD NORTH CA
2004-08-19 661-213-4XXX 4000–4999Assigned PACIFIC BELL 9740 BKFD NORTH CA
2004-08-12 661-675-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-08-12 661-860-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-08-05 661-444-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2004-07-20 661-340-5XXX 5000–5999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-07-19 661-341-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2004-07-06 661-370-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DELANO CA
2004-07-01 661-243-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD NORTH CA
2004-06-24 661-444-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2004-06-21 661-293-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 TAFT CA
2004-06-15 661-750-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TEHACHAPI CA
2004-06-10 661-607-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2004-06-10 661-877-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2004-06-10 661-877-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2004-06-09 661-675-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-06-09 661-675-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-06-02 661-916-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2004-05-21 661-340-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-05-21 661-565-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-05-21 661-565-4XXX 4000–4999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-05-21 661-877-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2004-05-13 661-367-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNCA SGCC CA
2004-05-11 661-615-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BKFD NORTH CA
2004-05-11 661-617-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BKFD SOUTH CA
2004-05-09 661-565-1XXX 1000–1999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-05-05 661-932-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2004-05-04 661-674-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2004-04-13 661-243-7XXX 7000–7999Assigned METROPCS, INC. 5562 BKFD NORTH CA
2004-04-13 661-349-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2004-04-13 661-349-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2004-04-09 661-341-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2004-04-07 661-300-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEHACHAPI CA
2004-04-01 661-778-7XXX 7000–7999Assigned METROPCS, INC. 5562 DELANO CA
2004-03-31 661-565-8XXX 8000–8999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-03-24 661-674-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2004-03-08 661-675-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-03-08 661-675-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2004-03-07 661-565-0XXX 0000–0999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2004-02-27 661-607-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2004-02-25 661-717-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN 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.