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
2015-11-18 520-965-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-11-04 520-900-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2015-10-30 520-900-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2015-10-27 520-604-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2015-10-20 520-833-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-10-20 520-833-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-10-20 520-833-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-10-15 520-277-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WHITLOW AZ
2015-10-12 520-833-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2015-10-05 520-993-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SELLS AZ
2015-10-01 520-636-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2015-09-25 520-348-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2015-09-22 520-595-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2015-09-15 520-635-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2015-09-15 520-965-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-15 520-965-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-15 520-965-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-15 520-965-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-15 520-965-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-15 520-965-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-09-04 520-589-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-09-04 520-589-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-08-24 520-635-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CASAGRANDE AZ
2015-08-24 520-719-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-08-24 520-719-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-08-24 520-719-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-08-18 520-900-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2015-08-18 520-900-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2015-08-18 520-900-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2015-08-13 520-635-0XXX 0000–0999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2015-08-11 520-589-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-08-11 520-833-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2015-08-06 520-595-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BENSON AZ
2015-08-06 520-635-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2015-07-30 520-589-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2015-07-30 520-589-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2015-07-24 520-719-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2015-07-24 520-719-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2015-07-16 520-263-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2015-07-16 520-658-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-07-16 520-658-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-07-16 520-658-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-07-16 520-729-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-07-16 520-729-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2015-07-16 520-729-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON 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.