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
2014-09-10 520-201-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SAN MANUEL AZ
2014-09-09 520-582-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2014-09-09 520-866-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2014-09-05 520-224-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2014-09-05 520-224-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2014-09-02 520-236-0XXX 0000–0999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2014-09-02 520-278-0XXX 0000–0999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-278-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-278-2XXX 2000–2999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-278-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-278-4XXX 4000–4999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-278-9XXX 9000–9999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-09-02 520-895-8XXX 8000–8999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2014-08-25 520-273-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-08-25 520-273-2XXX 2000–2999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-08-25 520-273-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-08-25 520-940-9XXX 9000–9999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-08-21 520-442-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2014-08-20 520-257-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-20 520-257-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-20 520-257-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-20 520-257-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-20 520-257-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-20 520-273-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-20 520-273-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-20 520-273-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-20 520-273-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-20 520-273-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-20 520-273-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-19 520-263-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SIERRAVIST AZ
2014-08-19 520-263-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J SIERRAVIST AZ
2014-08-15 520-328-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-15 520-328-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-15 520-999-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-08-11 520-213-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2014-08-11 520-424-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2014-08-11 520-450-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2014-08-07 520-213-1XXX 1000–1999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2014-08-07 520-448-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2014-08-07 520-448-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2014-08-07 520-448-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2014-08-04 520-357-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN AZ
2014-08-04 520-448-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-04 520-448-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-08-04 520-448-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-07-25 520-286-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-07-25 520-286-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-07-25 520-594-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-07-25 520-594-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-07-16 520-415-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F NOGALES 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.