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
2007-04-17 520-709-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2007-04-13 520-269-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-04-09 520-895-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2007-04-02 520-470-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2007-03-30 520-302-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-03-30 520-302-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-03-30 520-302-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-03-26 520-300-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-03-26 520-300-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-03-22 520-647-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-03-16 520-269-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2007-03-15 520-342-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2007-03-15 520-351-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2007-03-14 520-269-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-03-14 520-269-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-03-14 520-371-6XXX 6000–6999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2007-03-13 520-424-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-03-07 520-878-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-02-19 520-357-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 HAYDEN AZ
2007-02-16 520-423-9XXX 9000–9999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-02-15 520-385-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SAN MANUEL AZ
2007-02-14 520-302-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-02-13 520-251-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2007-02-09 520-269-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-02-09 520-269-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-02-09 520-425-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-02-09 520-437-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-02-09 520-455-2XXX 2000–2999Assigned METROPCS, INC. 5562 NOGALES AZ
2007-02-02 520-226-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SIERRAVIST AZ
2007-02-02 520-226-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SIERRAVIST AZ
2007-01-30 520-425-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2007-01-24 520-425-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-01-24 520-425-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-01-24 520-840-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2007-01-05 520-233-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2007-01-05 520-233-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2007-01-05 520-425-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-01-05 520-425-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-01-05 520-425-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-01-05 520-425-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-01-05 520-425-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-12-14 520-226-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2006-11-21 520-647-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-11-21 520-838-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-11-16 520-233-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2006-11-10 520-425-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-11-09 520-396-1XXX 1000–1999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2006-11-06 520-233-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2006-11-01 520-396-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2006-11-01 520-396-5XXX 5000–5999Assigned QWEST CORPORATION 9636 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.