NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2005-09-28 520-258-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-09-14 520-223-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 NOGALES AZ
2005-09-14 520-668-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-09-14 520-668-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-09-14 520-668-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-09-14 520-668-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-09-14 520-668-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-09-12 520-223-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2005-09-02 520-264-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2005-09-01 520-258-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-08-30 520-664-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2005-08-25 520-727-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DOUGLAS AZ
2005-08-19 520-407-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2005-08-19 520-483-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2005-08-19 520-495-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2005-08-19 520-609-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-08-19 520-668-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-08-19 520-904-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-08-19 520-904-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-08-19 520-904-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-08-17 520-254-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WILLCOX AZ
2005-08-17 520-366-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BISBEE AZ
2005-08-11 520-243-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-08-11 520-461-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-08-11 520-461-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-08-11 520-461-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-08-05 520-495-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2005-08-05 520-495-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2005-07-27 520-208-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2005-07-12 520-838-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2005-07-12 520-841-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2005-07-12 520-895-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SIERRAVIST AZ
2005-07-11 520-226-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2005-07-11 520-609-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-07-11 520-609-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-07-11 520-609-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-07-11 520-609-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-07-07 520-236-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2005-07-07 520-239-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-07-07 520-243-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-07-07 520-382-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-07-05 520-258-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-06-29 520-837-2XXX 2000–2999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-3XXX 3000–3999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-4XXX 4000–4999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-5XXX 5000–5999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-6XXX 6000–6999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-7XXX 7000–7999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-29 520-837-8XXX 8000–8999Assigned QWEST CORPORATION 9636 TUCSON AZ
2005-06-14 520-232-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.