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
2008-01-04 520-303-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2007-12-26 520-220-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2007-12-21 520-282-8XXX 8000–8999Assigned METROPCS, INC. 5562 TUCSON AZ
2007-12-20 520-302-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-12-10 520-727-2XXX 2000–2999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 DOUGLAS AZ
2007-11-21 520-344-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2007-11-21 520-344-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2007-11-20 520-282-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2007-11-20 520-582-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2007-11-14 520-282-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-11-14 520-282-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-11-14 520-282-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-11-14 520-351-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2007-11-14 520-840-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2007-11-14 520-840-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2007-11-08 520-858-7XXX 7000–7999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-11-08 520-858-8XXX 8000–8999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-11-07 520-414-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2007-10-29 520-413-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2007-10-25 520-351-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-10-24 520-344-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2007-10-24 520-509-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2007-10-16 520-252-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2007-10-15 520-305-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-09-27 520-413-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2007-09-21 520-343-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-09-21 520-343-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-09-21 520-343-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-09-19 520-301-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-09-19 520-301-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-09-19 520-301-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-09-19 520-301-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-09-19 520-301-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2007-09-17 520-397-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2007-09-14 520-443-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-09-07 520-282-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-08-29 520-265-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BENSON AZ
2007-08-29 520-300-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TUCSON AZ
2007-08-29 520-300-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TUCSON AZ
2007-08-29 520-301-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2007-08-29 520-343-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-08-29 520-343-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2007-08-28 520-220-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2007-08-27 520-582-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-08-27 520-582-3XXX 3000–3999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2007-08-22 520-413-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2007-08-17 520-343-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-08-17 520-343-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-08-17 520-343-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2007-08-17 520-840-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE 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.