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
2020-08-27 520-380-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2020-08-27 520-380-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2020-08-20 520-523-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2020-08-12 520-436-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2020-08-12 520-436-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2020-08-12 520-438-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2020-08-12 520-438-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2020-08-12 520-453-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2020-08-12 520-453-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2020-08-10 520-475-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-08-10 520-475-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-07-28 520-475-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TUCSON AZ
2020-07-28 520-475-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-07-28 520-475-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-07-28 520-475-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-07-28 520-475-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-07-28 520-839-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2020-07-23 520-438-1XXX 1000–1999Assigned TELNYX LLC 073H WHITLOW AZ
2020-07-23 520-479-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2020-07-23 520-479-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2020-07-14 520-472-0XXX 0000–0999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2020-07-14 520-523-0XXX 0000–0999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2020-07-06 520-380-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2020-07-02 520-475-0XXX 0000–0999Assigned METROPCS, INC. 5562 TUCSON AZ
2020-07-02 520-475-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2020-07-02 520-600-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2020-06-25 520-849-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2020-06-16 520-379-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H DOUGLAS AZ
2020-06-16 520-379-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H DOUGLAS AZ
2020-06-16 520-379-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H DOUGLAS AZ
2020-06-05 520-475-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J TUCSON AZ
2020-06-04 520-372-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-06-04 520-372-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-06-04 520-372-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-06-04 520-479-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-06-04 520-479-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-06-03 520-502-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E SASABE AZ
2020-06-03 520-522-2XXX 2000–2999Assigned FRACTEL, LLC 965H CASABLANCA AZ
2020-06-03 520-655-5XXX 5000–5999Assigned FRACTEL, LLC 965H SUPERIOR AZ
2020-06-02 520-779-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 WILLCOX AZ
2020-05-28 520-636-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SAN MANUEL AZ
2020-05-26 520-420-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-05-26 520-420-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-05-26 520-420-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-05-26 520-420-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-05-26 520-436-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 HAYDEN AZ
2020-05-19 520-379-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2020-05-15 520-372-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2020-05-12 520-849-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2020-05-08 520-523-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SIERRAVIST 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.