NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2014-03-31 661-447-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-03-31 661-447-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-03-31 661-471-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2014-03-24 661-425-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA NHCS CA
2014-03-24 661-486-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D PLDL AGDL CA
2014-03-24 661-556-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2014-03-24 661-556-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2014-03-19 661-769-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TAFT CA
2014-03-18 661-410-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BKFD NORTH CA
2014-03-18 661-447-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2014-03-18 661-857-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA NHCS CA
2014-03-17 661-695-9XXX 9000–9999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD NORTH CA
2014-03-14 661-430-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SNCA SGCC CA
2014-03-07 661-447-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-03-07 661-447-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-03-07 661-903-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARVIN CA
2014-03-06 661-473-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD SOUTH CA
2014-03-05 661-429-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-03-04 661-436-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2014-03-04 661-447-4XXX 4000–4999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2014-02-26 661-214-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LOST HILLS CA
2014-02-26 661-235-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ROSAMOND CA
2014-02-26 661-438-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WASCO CA
2014-02-25 661-481-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D SNCA NHCS CA
2014-02-25 661-666-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNCA NHCS CA
2014-02-24 661-231-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LEBEC CA
2014-02-17 661-447-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-02-17 661-447-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2014-02-12 661-473-1XXX 1000–1999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD SOUTH CA
2014-02-07 661-410-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C BKFD NORTH CA
2014-01-24 661-623-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TAFT CA
2014-01-14 661-299-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2014-01-14 661-485-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLDL PLDL CA
2014-01-09 661-481-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-01-09 661-481-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-01-08 661-485-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2014-01-08 661-485-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2013-12-23 661-473-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2013-12-23 661-529-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2013-12-09 661-220-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ARVIN CA
2013-12-09 661-221-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C MOJAVE CA
2013-12-09 661-231-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C LEBEC CA
2013-12-09 661-279-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ROSAMOND CA
2013-12-09 661-299-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNCA SGCC CA
2013-12-09 661-344-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E EARLIMART CA
2013-12-09 661-344-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C EARLIMART CA
2013-12-09 661-410-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C BKFD NORTH CA
2013-12-09 661-429-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LANCASTER CA
2013-12-09 661-429-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LANCASTER CA
2013-12-09 661-434-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLDL PLDL CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.