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
2022-04-12 661-571-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2022-04-12 661-955-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARVIN CA
2022-04-11 661-584-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MOJAVE CA
2022-03-24 661-570-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BKFD SOUTH CA
2022-03-16 661-569-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2022-03-16 661-569-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2022-03-16 661-581-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2022-03-16 661-581-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLDL PLDL CA
2022-03-15 661-242-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J LEBEC CA
2022-03-15 661-766-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J CUYAMA CA
2022-03-12 661-570-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2022-03-12 661-570-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2022-03-09 661-570-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2022-02-25 661-933-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BKFD NORTH CA
2022-02-24 661-550-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BIG BUTTE CA
2022-02-24 661-601-1XXX 1000–1999Assigned COMMIO, LLC 939H BKFD NORTH CA
2022-02-24 661-639-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LAKEHUGHES CA
2022-02-22 661-539-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MCFARLAND CA
2022-02-18 661-639-7XXX 7000–7999Assigned TON80 COMMUNICATIONS, LLC 516J LAKEHUGHES CA
2022-02-09 661-936-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2022-02-09 661-936-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2022-02-09 661-936-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2022-02-09 661-936-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2022-02-09 661-936-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2022-02-01 661-560-5XXX 5000–5999Assigned TWILIO INTERNATIONAL, INC. 506J WASCO CA
2022-01-26 661-550-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BIG BUTTE CA
2022-01-11 661-760-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUTTONWLLW CA
2022-01-09 661-292-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SHAFTER CA
2022-01-09 661-776-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SHAFTER CA
2022-01-07 661-625-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H SNCA NHCS CA
2022-01-07 661-625-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H SNCA NHCS CA
2022-01-05 661-581-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H PLDL PLDL CA
2022-01-05 661-581-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H PLDL PLDL CA
2021-12-22 661-761-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MCKITTRICK CA
2021-12-17 661-499-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2021-12-10 661-569-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 661-569-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 661-569-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 661-569-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 661-569-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 661-569-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-09 661-541-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-09 661-843-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-09 661-846-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-09 661-863-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-08 661-298-6XXX 6000–6999Assigned TERRA NOVA TELECOM INC. 145J SNCA SGCC CA
2021-12-08 661-625-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-12-08 661-625-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-12-08 661-625-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-11-29 661-230-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C EDWARDS 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.