NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2014-10-22 520-860-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F NOGALES AZ
2014-10-22 520-860-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F NOGALES AZ
2014-10-21 520-729-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2014-10-17 520-389-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-10-17 520-389-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2014-10-09 520-389-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-06 520-201-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E SAN MANUEL AZ
2014-10-06 520-201-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SAN MANUEL AZ
2014-10-06 520-337-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E WILLCOX AZ
2014-10-06 520-356-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2014-10-06 520-356-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2014-10-06 520-827-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2014-10-06 520-827-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2014-10-06 520-987-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2014-10-06 520-987-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2014-10-02 520-335-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2014-10-02 520-424-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2014-10-02 520-645-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2014-10-02 520-645-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2014-09-30 520-210-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TOMBSTONE AZ
2014-09-30 520-210-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TOMBSTONE AZ
2014-09-30 520-257-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-09-30 520-273-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-09-30 520-278-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-09-30 520-442-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2014-09-30 520-989-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-09-26 520-895-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SIERRAVIST AZ
2014-09-25 520-283-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-25 520-283-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2014-09-24 520-363-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN AZ
2014-09-24 520-363-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN AZ
2014-09-24 520-788-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2014-09-24 520-788-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2014-09-18 520-210-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ
2014-09-18 520-353-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2014-09-16 520-251-7XXX 7000–7999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2014-09-16 520-257-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2014-09-16 520-510-4XXX 4000–4999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2014-09-12 520-257-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2014-09-12 520-257-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2014-09-12 520-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2014-09-11 520-337-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WILLCOX AZ
2014-09-11 520-689-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SUPERIOR AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.