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
2021-11-30 520-605-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2021-11-30 520-605-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2021-11-29 520-233-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2021-11-29 520-564-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DOUGLAS AZ
2021-11-20 520-583-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2021-11-19 520-590-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2021-11-19 520-590-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2021-11-16 520-556-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2021-11-16 520-598-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2021-11-15 520-563-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BENSON AZ
2021-11-15 520-563-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BENSON AZ
2021-11-15 520-564-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H DOUGLAS AZ
2021-11-15 520-564-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H DOUGLAS AZ
2021-11-15 520-592-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H NOGALES AZ
2021-11-15 520-592-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H NOGALES AZ
2021-11-10 520-451-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-451-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-451-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-451-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-590-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2021-11-10 520-590-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2021-11-10 520-596-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-596-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-596-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-10 520-596-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-11-04 520-993-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SELLS AZ
2021-10-29 520-478-0XXX 0000–0999Assigned COMMIO, LLC 939H AJO AZ
2021-10-29 520-478-1XXX 1000–1999Assigned COMMIO, LLC 939H AJO AZ
2021-10-28 520-242-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-242-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-451-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 520-451-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 520-451-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 520-451-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 520-451-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 520-563-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2021-10-28 520-564-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2021-10-28 520-564-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2021-10-28 520-564-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2021-10-28 520-567-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2021-10-28 520-567-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2021-10-28 520-569-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SAN MANUEL 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.