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
2012-11-16 520-484-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2012-11-16 520-484-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2012-11-16 520-487-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SAN MANUEL AZ
2012-11-16 520-827-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2012-11-12 520-355-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-12 520-460-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-08 520-999-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2012-11-08 520-999-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2012-11-08 520-999-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2012-11-08 520-999-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2012-11-07 520-686-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BENSON AZ
2012-11-01 520-373-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-01 520-373-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-01 520-373-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-11-01 520-373-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-10-26 520-484-1XXX 1000–1999Assigned NUSO, LLC 551G TUCSON AZ
2012-10-03 520-277-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2012-10-03 520-277-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2012-10-03 520-277-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2012-10-03 520-277-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2012-09-25 520-442-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F BENSON AZ
2012-09-21 520-460-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2012-09-21 520-878-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2012-09-17 520-612-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-09-17 520-612-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-09-17 520-612-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2012-09-13 520-355-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-13 520-355-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-08-29 520-332-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-08-29 520-612-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-08-29 520-612-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-08-21 520-332-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2012-08-14 520-422-9XXX 9000–9999Assigned AT&T - LOCAL 7421 BISBEE AZ
2012-08-08 520-510-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2012-08-07 520-612-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2012-08-01 520-332-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-08-01 520-612-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-07-31 520-221-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BENSON 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.