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
2014-11-04 661-493-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2014-11-04 661-493-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2014-10-31 661-485-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K PLDL PLDL CA
2014-10-29 661-390-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2014-10-29 661-390-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2014-10-27 661-489-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD MAIN CA
2014-10-27 661-489-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD MAIN CA
2014-10-27 661-491-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2014-10-27 661-491-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2014-10-27 661-615-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD NORTH CA
2014-10-27 661-679-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD NORTH CA
2014-10-20 661-494-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-10-17 661-485-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 PLDL PLDL CA
2014-10-17 661-489-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD MAIN CA
2014-10-16 661-523-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SNCA SGCC CA
2014-10-16 661-523-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SNCA SGCC CA
2014-10-14 661-425-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2014-10-14 661-445-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-14 661-445-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LANCASTER CA
2014-10-13 661-425-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNCA NHCS CA
2014-10-13 661-448-9XXX 9000–9999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2014-10-10 661-413-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CUYAMA CA
2014-10-10 661-494-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2014-10-10 661-523-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2014-10-02 661-261-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C BIG BUTTE CA
2014-09-25 661-493-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2014-09-24 661-469-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUTTONWLLW CA
2014-09-19 661-493-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2014-09-19 661-493-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C BKFD MAIN CA
2014-09-18 661-436-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2014-09-05 661-520-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-09-05 661-520-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD MAIN CA
2014-09-02 661-771-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 TEHACHAPI CA
2014-08-29 661-438-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WASCO CA
2014-08-29 661-903-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARVIN CA
2014-08-28 661-493-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C BKFD MAIN CA
2014-08-27 661-430-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNCA SGCC CA
2014-08-27 661-483-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2014-08-08 661-489-3XXX 3000–3999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2014-08-08 661-489-5XXX 5000–5999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2014-08-06 661-483-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2014-08-06 661-483-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 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.