NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 520
NEW CINGULAR WIRELESS PCS, LLC 3
INTRADO COMMUNICATIONS, LLC 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
2023-03-09 520-672-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-672-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-672-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-672-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-672-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-672-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-673-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-03-09 520-674-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2023-02-17 520-656-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2023-02-17 520-659-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2023-02-17 520-702-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2023-02-17 520-772-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SUPERIOR AZ
2023-02-13 520-667-1XXX 1000–1999Assigned NUSO, LLC 732J TUCSON AZ
2023-02-10 520-581-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TOMBSTONE AZ
2023-02-06 520-654-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2023-02-06 520-654-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2023-02-06 520-654-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2023-01-25 520-557-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2023-01-25 520-557-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2023-01-24 520-557-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2023-01-24 520-590-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2023-01-24 520-652-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2023-01-24 520-657-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2023-01-19 520-540-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2023-01-13 520-557-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2023-01-05 520-557-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2023-01-05 520-557-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2023-01-05 520-557-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2022-12-15 520-282-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2022-12-15 520-284-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2022-12-15 520-460-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2022-12-15 520-540-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.