NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

16 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
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
2016-08-15 661-279-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ROSAMOND CA
2016-08-04 661-306-8XXX 8000–8999Assigned HD CARRIER LLC 321J LAKEHUGHES CA
2016-08-03 661-593-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA NHCS CA
2016-08-02 661-593-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNCA NHCS CA
2016-07-19 661-567-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD MAIN CA
2016-07-15 661-365-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-07-15 661-365-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-07-15 661-365-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-07-15 661-593-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2016-07-07 661-365-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2016-07-07 661-553-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2016-07-07 661-558-5XXX 5000–5999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-07-07 661-558-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-07-07 661-772-6XXX 6000–6999Assigned METROPCS, INC. 5562 WASCO CA
2016-06-24 661-568-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA NHCS CA
2016-06-23 661-542-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA SGCC CA
2016-06-22 661-365-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLDL PLDL CA
2016-06-22 661-488-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LANCASTER CA
2016-06-22 661-563-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-22 661-563-5XXX 5000–5999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-22 661-563-6XXX 6000–6999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-22 661-563-8XXX 8000–8999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-22 661-563-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-22 661-567-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-06-03 661-582-7XXX 7000–7999Assigned PACIFIC BELL (COMPETITIVE) 7480 LANCASTER CA
2016-05-24 661-365-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-05-24 661-365-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-05-24 661-365-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-05-18 661-338-8XXX 8000–8999Assigned HD CARRIER LLC 321J LAKEHUGHES CA
2016-05-18 661-464-6XXX 6000–6999Assigned HD CARRIER LLC 321J LAKEHUGHES CA
2016-05-18 661-464-8XXX 8000–8999Assigned HD CARRIER LLC 321J LAKEHUGHES CA
2016-05-18 661-464-9XXX 9000–9999Assigned HD CARRIER LLC 321J LAKEHUGHES CA
2016-05-18 661-558-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-05-18 661-573-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2016-05-18 661-573-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2016-05-16 661-568-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K SNCA NHCS CA
2016-05-16 661-568-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2016-05-16 661-582-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LANCASTER CA
2016-05-09 661-527-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BKFD SOUTH CA
2016-05-09 661-546-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BKFD MAIN CA
2016-05-04 661-293-5XXX 5000–5999Assigned METROPCS, INC. 5562 TAFT CA
2016-04-29 661-573-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C BKFD MAIN CA
2016-04-26 661-563-7XXX 7000–7999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2016-04-26 661-585-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-04-01 661-383-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D SNCA NHCS CA
2016-04-01 661-585-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2016-03-24 661-535-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C BKFD NORTH CA
2016-03-24 661-535-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C BKFD NORTH CA
2016-03-24 661-558-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2016-03-24 661-558-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C 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.