NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

7 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 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
2011-04-18 231-577-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CADILLAC MI
2011-04-18 231-768-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LE ROY MI
2011-04-18 231-907-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LUDINGTON MI
2011-04-12 231-480-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 LUDINGTON MI
2011-04-01 231-412-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HARBOR SPG MI
2011-04-01 231-580-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BIG RAPIDS MI
2011-04-01 231-629-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BIG RAPIDS MI
2011-03-29 231-709-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2011-03-28 231-245-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2011-03-28 231-245-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2011-03-28 231-398-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2011-03-15 231-465-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E REED CITY MI
2011-03-15 231-498-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ELK RAPIDS MI
2011-03-15 231-844-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E INDIAN RIV MI
2011-03-04 231-667-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARION MI
2011-02-28 231-715-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2011-02-28 231-735-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2011-02-25 231-492-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2011-02-23 231-672-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2011-02-22 231-220-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-220-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-220-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-220-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-220-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-220-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-02-22 231-465-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E REED CITY MI
2011-02-22 231-753-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2011-02-10 231-238-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E INDIAN RIV MI
2011-02-10 231-498-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ELK RAPIDS MI
2011-01-28 231-760-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2011-01-27 231-224-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREMONT MI
2011-01-26 231-373-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PETOSKEY MI
2011-01-26 231-884-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2011-01-26 231-994-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E LKLEELANAU MI
2011-01-24 231-345-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E REED CITY MI
2011-01-19 231-580-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BIG RAPIDS MI
2011-01-19 231-674-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C GRANT MI
2011-01-19 231-719-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-01-19 231-719-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-01-19 231-720-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-01-19 231-720-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2011-01-07 231-818-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
2010-12-20 231-720-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2010-12-10 231-468-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CADILLAC MI
2010-12-03 231-245-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2010-12-03 231-421-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2010-12-02 231-714-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2010-11-18 231-421-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2010-11-10 231-872-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
2010-10-11 231-412-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HARBOR SPG MI

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.