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
2016-05-02 520-200-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 HAYDEN AZ
2016-04-28 520-619-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2016-04-21 520-224-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2016-04-11 520-231-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WHITLOW AZ
2016-03-30 520-217-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2016-03-24 520-352-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2016-03-24 520-585-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2016-03-23 520-217-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2016-03-23 520-217-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2016-03-23 520-231-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2016-03-23 520-244-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2016-03-23 520-244-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2016-03-23 520-244-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2016-03-23 520-263-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2016-03-23 520-263-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2016-03-23 520-277-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2016-03-23 520-348-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E WILLCOX AZ
2016-03-23 520-348-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E WILLCOX AZ
2016-03-23 520-353-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2016-03-23 520-422-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2016-03-23 520-595-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2016-03-23 520-595-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2016-03-23 520-597-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2016-03-23 520-597-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2016-03-23 520-619-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2016-03-23 520-619-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2016-03-23 520-645-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2016-03-23 520-645-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2016-03-18 520-585-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2016-03-18 520-585-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2016-03-16 520-244-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2016-03-14 520-415-8XXX 8000–8999Assigned METROPCS, INC. 5562 NOGALES AZ
2016-03-14 520-595-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2016-03-14 520-595-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2016-03-11 520-585-0XXX 0000–0999Assigned METROPCS, INC. 5562 TUCSON AZ
2016-03-11 520-585-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2016-03-11 520-585-2XXX 2000–2999Assigned METROPCS, INC. 5562 TUCSON AZ
2016-03-11 520-585-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2016-03-11 520-585-9XXX 9000–9999Assigned METROPCS, INC. 5562 TUCSON AZ
2016-03-10 520-210-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2016-03-10 520-210-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2016-03-09 520-639-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2016-03-09 520-645-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2016-03-09 520-645-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2016-03-03 520-470-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2016-03-03 520-470-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2016-02-25 520-353-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2016-02-25 520-353-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2016-02-24 520-217-0XXX 0000–0999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2016-02-24 520-348-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E WILLCOX 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.