NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 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
2021-03-22 520-910-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-17 520-650-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2021-03-17 520-650-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2021-03-11 520-650-1XXX 1000–1999Assigned TELNYX LLC 073H WHITLOW AZ
2021-03-08 520-527-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2021-03-05 520-537-1XXX 1000–1999Assigned IP HORIZON LLC 515J TUCSON AZ
2021-02-23 520-536-0XXX 0000–0999Assigned TELNYX LLC 073H DOUGLAS AZ
2021-02-22 520-479-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-479-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-479-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-479-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-534-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-534-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-534-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-22 520-534-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-02-19 520-860-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2021-02-15 520-534-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-02-15 520-534-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-02-15 520-534-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-02-12 520-506-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TOMBSTONE AZ
2021-02-11 520-593-0XXX 0000–0999Assigned TELNYX LLC 073H HAYDEN AZ
2021-02-10 520-534-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2021-02-08 520-346-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2021-02-08 520-473-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2021-02-02 520-910-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2021-01-27 520-532-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-01-27 520-532-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-01-27 520-532-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-01-27 520-532-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-01-27 520-532-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-01-19 520-521-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2021-01-19 520-637-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2021-01-12 520-534-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-01-12 520-534-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-01-08 520-536-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2021-01-08 520-593-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2021-01-07 520-503-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2021-01-06 520-524-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-01-06 520-524-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-01-06 520-524-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-01-06 520-839-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2021-01-06 520-839-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2021-01-06 520-839-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2021-01-05 520-527-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2020-12-28 520-506-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ

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.