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
2021-07-07 520-541-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-07-07 520-541-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-07-01 520-482-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-482-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-482-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-07-01 520-543-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2021-06-29 520-502-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H SASABE AZ
2021-06-28 520-216-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2021-06-28 520-216-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2021-06-28 520-504-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H SIERRAVIST AZ
2021-06-28 520-521-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H SAN MANUEL AZ
2021-06-28 520-552-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BISBEE AZ
2021-06-28 520-580-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H SUPERIOR AZ
2021-06-28 520-593-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H HAYDEN AZ
2021-06-28 520-604-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2021-06-28 520-924-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2021-06-28 520-980-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H NOGALES AZ
2021-06-27 520-543-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 TUCSON AZ
2021-06-27 520-650-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H WHITLOW AZ
2021-06-22 520-496-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-496-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-496-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-496-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-496-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-496-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-06-22 520-503-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-06-22 520-503-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-06-15 520-552-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2021-06-11 520-543-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2021-06-09 520-496-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2021-06-09 520-496-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2021-06-09 520-496-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2021-06-07 520-593-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2021-06-07 520-593-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2021-06-07 520-650-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2021-06-07 520-655-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2021-06-07 520-839-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2021-06-07 520-839-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2021-06-07 520-839-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2021-06-07 520-860-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2021-06-02 520-379-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2021-06-02 520-527-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2021-06-02 520-527-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2021-06-02 520-536-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E DOUGLAS 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.