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
2014-08-06 661-483-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-08-06 661-483-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-07-31 661-483-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LANCASTER CA
2014-07-31 661-704-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MCKITTRICK CA
2014-07-30 661-483-5XXX 5000–5999Assigned PACIFIC BELL (COMPETITIVE) 7480 LANCASTER CA
2014-07-24 661-483-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LANCASTER CA
2014-07-22 661-927-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MCFARLAND CA
2014-07-21 661-231-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LEBEC CA
2014-07-21 661-237-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SHAFTER CA
2014-07-17 661-606-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2014-07-14 661-271-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MOJAVE CA
2014-07-14 661-768-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J TAFT CA
2014-07-03 661-360-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2014-07-01 661-430-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C SNCA SGCC CA
2014-06-24 661-483-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-06-24 661-483-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-06-18 661-425-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-06-18 661-425-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-06-18 661-425-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-06-18 661-556-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2014-06-17 661-679-3XXX 3000–3999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD NORTH CA
2014-06-16 661-387-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD NORTH CA
2014-06-16 661-410-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD NORTH CA
2014-06-16 661-556-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD SOUTH CA
2014-06-16 661-556-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD SOUTH CA
2014-06-13 661-470-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-13 661-470-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-06-11 661-426-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-11 661-437-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-11 661-437-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-11 661-440-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-11 661-440-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-11 661-440-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-06-09 661-470-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2014-06-06 661-455-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GLENNVILLE CA
2014-06-04 661-780-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PLDL LNVY CA
2014-05-30 661-306-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAKEHUGHES CA
2014-05-30 661-339-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HI VISTA CA
2014-05-30 661-471-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-05-30 661-532-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BIG BUTTE CA
2014-05-30 661-941-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-05-30 661-941-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-05-30 661-941-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 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.