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
2005-02-15 520-236-3XXX 3000–3999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2005-02-09 520-203-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-02-09 520-204-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2005-02-09 520-204-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2005-02-09 520-204-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2005-02-03 520-234-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2005-01-31 520-780-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-01-31 520-780-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2005-01-27 520-668-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-01-27 520-668-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2005-01-27 520-777-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2005-01-27 520-867-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2005-01-27 520-867-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2005-01-27 520-867-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2005-01-20 520-720-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2005-01-19 520-423-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2005-01-10 520-226-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SIERRAVIST AZ
2005-01-10 520-829-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2005-01-05 520-223-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2005-01-03 520-254-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WILLCOX AZ
2004-12-30 520-236-4XXX 4000–4999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2004-12-30 520-236-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2004-12-28 520-203-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-12-21 520-609-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-12-21 520-609-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-12-21 520-827-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SUPERIOR AZ
2004-12-13 520-829-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2004-12-13 520-829-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2004-11-23 520-457-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2004-11-18 520-429-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-11-18 520-429-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-11-18 520-829-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-11-18 520-829-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-11-16 520-236-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2004-11-15 520-223-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2004-11-08 520-203-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-10-28 520-777-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2004-10-20 520-204-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-10-13 520-260-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-10-13 520-260-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-10-13 520-366-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BISBEE AZ
2004-10-13 520-429-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-10-13 520-483-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2004-10-12 520-207-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-10-12 520-232-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-10-08 520-236-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2004-10-08 520-236-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2004-10-08 520-236-9XXX 9000–9999Assigned METROPCS, INC. 5562 SIERRAVIST AZ
2004-09-16 520-829-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2004-09-07 520-204-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON 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.