NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

10 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 517
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 5
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 1
LEVEL 3 COMMUNICATIONS, LLC - MI 1
INTRADO COMMUNICATIONS, LLC 1
BOOST SUBSCRIBERCO L.L.C. 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
2004-12-21 517-477-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOLT MI
2004-12-14 517-224-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTTERVL MI
2004-12-14 517-386-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EATON RPD MI
2004-12-14 517-507-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2004-12-14 517-623-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANSVILLE MI
2004-12-14 517-626-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDLEDGE MI
2004-12-14 517-628-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ONONDAGA MI
2004-12-14 517-651-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAINGSBURG MI
2004-12-14 517-667-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLOTTE MI
2004-12-14 517-668-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DE WITT MI
2004-12-14 517-743-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORTLAND MI
2004-12-14 517-833-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MASON MI
2004-12-14 517-992-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLIAMSTN MI
2004-12-10 517-392-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JACKSON MI
2004-12-06 517-392-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2004-12-03 517-391-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-12-03 517-391-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-11-29 517-442-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2004-11-05 517-391-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-11-05 517-391-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-11-02 517-803-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-10-26 517-736-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 COLDWATER MI
2004-10-22 517-224-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 POTTERVL MI
2004-10-22 517-803-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-10-22 517-833-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MASON MI
2004-10-22 517-853-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LANSING MI
2004-10-18 517-268-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLT MI
2004-10-18 517-306-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HUDSON MI
2004-10-18 517-308-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DIMONDALE MI
2004-10-18 517-386-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 EATON RPD MI
2004-10-18 517-536-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NAPOLEON MI
2004-10-18 517-589-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LESLIE MI
2004-10-18 517-639-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 QUINCY MI
2004-09-29 517-425-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2004-09-21 517-853-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2004-09-16 517-803-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-09-09 517-308-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DIMONDALE MI
2004-09-09 517-308-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DIMONDALE MI
2004-09-09 517-386-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2004-09-09 517-652-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 CHARLOTTE MI
2004-08-23 517-756-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 UNION CITY MI
2004-08-06 517-244-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MASON MI
2004-08-06 517-268-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2004-08-06 517-308-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DIMONDALE MI
2004-08-06 517-386-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2004-08-06 517-623-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DANSVILLE MI
2004-08-06 517-645-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 POTTERVL MI
2004-07-15 517-391-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-07-15 517-391-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2004-07-06 517-219-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FOWLERVL 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.