NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

7 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 231
NEW CINGULAR WIRELESS PCS, LLC - IL 2
EXIANT COMMUNICATIONS LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
AHOI LLC 1
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
2010-02-09 231-613-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SCOTTVILLE MI
2010-02-09 231-912-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
2010-01-28 231-335-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREMONT MI
2010-01-28 231-753-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PETOSKEY MI
2010-01-28 231-818-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2010-01-25 231-846-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2010-01-19 231-373-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2010-01-15 231-676-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLAIRE MI
2010-01-15 231-884-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2009-12-31 231-735-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-12-31 231-735-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-12-31 231-735-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-12-03 231-242-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HARBOR SPG MI
2009-12-03 231-245-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWAYGO MI
2009-10-30 231-220-2XXX 2000–2999Assigned 123.NET, LLC 2550 MUSKEGON MI
2009-10-30 231-855-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-10-30 231-855-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-10-30 231-855-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-10-30 231-912-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
2009-10-26 231-245-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWAYGO MI
2009-10-23 231-709-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2009-10-23 231-709-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2009-10-22 231-450-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HESPERIA MI
2009-10-22 231-907-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
2009-10-14 231-955-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-10-14 231-955-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-09-30 231-742-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HART MI
2009-09-23 231-527-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BIG RAPIDS MI
2009-09-21 231-942-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CADILLAC MI
2009-09-21 231-942-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CADILLAC MI
2009-09-17 231-729-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IRONS MI
2009-09-14 231-459-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BOYNE CITY MI
2009-09-14 231-884-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2009-09-04 231-267-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 WILLIAMSBG MI
2009-09-04 231-421-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2009-09-04 231-492-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-09-04 231-492-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-09-04 231-955-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-09-04 231-955-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-09-04 231-955-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-08-28 231-753-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K PETOSKEY MI
2009-08-27 231-225-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREMONT MI
2009-08-27 231-527-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIG RAPIDS MI
2009-08-27 231-823-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STANWOOD MI
2009-08-27 231-856-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORLEY MI
2009-08-18 231-709-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2009-08-14 231-955-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-08-14 231-955-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2009-08-07 231-818-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
2009-08-03 231-735-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI

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.