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
2012-01-23 520-369-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-23 520-369-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-23 520-369-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-12 520-333-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-12 520-333-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-12 520-333-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-01-11 520-253-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WILLCOX AZ
2011-12-19 520-251-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2011-11-23 520-686-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 BENSON AZ
2011-11-10 520-222-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-11-10 520-222-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-11-10 520-222-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-11-08 520-230-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2011-10-18 520-222-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-10-18 520-812-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-10-14 520-333-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-10-14 520-333-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-10-12 520-338-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2011-10-10 520-222-0XXX 0000–0999Assigned QWEST CORPORATION 9636 TUCSON AZ
2011-10-10 520-222-1XXX 1000–1999Assigned QWEST CORPORATION 9636 TUCSON AZ
2011-10-06 520-366-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2011-10-06 520-366-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2011-10-05 520-314-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2011-10-05 520-333-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2011-09-30 520-369-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2011-09-30 520-812-8XXX 8000–8999Assigned VALLEY CONNECTIONS, L.L.C. - AZ 183D TUCSON AZ
2011-09-29 520-391-3XXX 3000–3999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 SUPERIOR AZ
2011-09-28 520-724-9XXX 9000–9999Assigned QWEST CORPORATION 9636 TUCSON AZ
2011-09-26 520-860-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 NOGALES AZ
2011-09-16 520-477-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2011-09-16 520-477-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TUCSON AZ
2011-09-09 520-224-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SIERRAVIST AZ
2011-09-02 520-288-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-09-02 520-288-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-09-02 520-329-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2011-09-02 520-335-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J SIERRAVIST AZ
2011-08-31 520-812-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2011-08-22 520-858-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2011-08-11 520-356-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2011-08-11 520-610-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SACATON AZ
2011-08-09 520-288-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2011-08-09 520-288-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2011-07-26 520-221-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BENSON AZ
2011-07-20 520-216-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F NOGALES AZ
2011-07-18 520-812-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-07-18 520-812-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-07-18 520-812-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-07-18 520-812-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-07-18 520-812-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2011-07-11 520-200-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN 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.