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
2021-10-28 520-569-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SAN MANUEL AZ
2021-10-28 520-581-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2021-10-28 520-583-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2021-10-28 520-583-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2021-10-26 520-596-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 520-596-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 520-596-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 520-596-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 520-596-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 520-596-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-25 520-605-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-25 520-605-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2021-10-21 520-556-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H SIERRAVIST AZ
2021-10-21 520-556-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H SIERRAVIST AZ
2021-10-21 520-598-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2021-10-20 520-583-7XXX 7000–7999Assigned COMMIO, LLC 939H WHITLOW AZ
2021-10-20 520-583-8XXX 8000–8999Assigned COMMIO, LLC 939H WHITLOW AZ
2021-10-19 520-541-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-18 520-563-8XXX 8000–8999Assigned COMMIO, LLC 939H BENSON AZ
2021-10-18 520-563-9XXX 9000–9999Assigned COMMIO, LLC 939H BENSON AZ
2021-10-18 520-598-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-10-18 520-598-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-10-18 520-598-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-10-18 520-598-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-10-18 520-598-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2021-10-15 520-699-9XXX 9000–9999Assigned FRACTEL, LLC 965H SIERRAVIST AZ
2021-10-14 520-583-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H WHITLOW AZ
2021-10-14 520-583-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H WHITLOW AZ
2021-10-13 520-567-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H HAYDEN AZ
2021-10-13 520-567-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H HAYDEN AZ
2021-10-13 520-569-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H SAN MANUEL AZ
2021-10-13 520-569-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H SAN MANUEL AZ
2021-10-13 520-598-0XXX 0000–0999Assigned TELNYX LLC 073H CASAGRANDE AZ
2021-10-13 520-688-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-10-13 520-688-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-10-13 520-688-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-10-13 520-688-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-10-13 520-688-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-10-11 520-564-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DOUGLAS AZ
2021-10-11 520-598-9XXX 9000–9999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2021-10-11 520-688-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2021-10-08 520-542-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-10-08 520-542-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-10-08 520-542-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-10-08 520-542-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H TUCSON 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.