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
2006-06-29 520-289-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-06-22 520-437-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-06-22 520-437-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-06-20 520-610-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SACATON AZ
2006-06-19 520-226-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2006-06-14 520-668-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-06-13 520-437-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-06-06 520-437-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-06-01 520-829-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-06-01 520-829-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-05-30 520-437-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-05-30 520-437-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-05-30 520-437-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-05-30 520-437-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-05-30 520-483-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2006-05-26 520-236-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2006-05-24 520-770-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2006-05-16 520-226-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2006-05-16 520-243-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-05-16 520-576-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-05-16 520-576-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-05-16 520-576-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-05-09 520-431-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2006-05-09 520-431-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2006-05-08 520-664-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-05-04 520-208-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2006-04-27 520-483-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2006-04-27 520-483-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2006-04-27 520-664-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-04-27 520-664-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-04-27 520-664-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-04-13 520-226-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 SIERRAVIST AZ
2006-04-13 520-988-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 NOGALES AZ
2006-04-06 520-461-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-03-31 520-437-0XXX 0000–0999Assigned XO ARIZONA, INC. 4793 TUCSON AZ
2006-03-15 520-393-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-03-08 520-903-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-03-08 520-903-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-03-08 520-903-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-03-07 520-208-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2006-03-03 520-689-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SUPERIOR AZ
2006-03-02 520-576-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2006-03-01 520-309-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-03-01 520-647-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2006-02-27 520-720-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2006-02-23 520-616-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2006-02-21 520-838-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-02-17 520-867-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-02-09 520-494-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CASAGRANDE AZ
2006-02-06 520-495-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 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.