NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

10 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 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
2022-01-07 517-893-8XXX 8000–8999Assigned TWILIO INTERNATIONAL, INC. 506J LANSING MI
2022-01-06 517-767-8XXX 8000–8999Assigned TON80 COMMUNICATIONS, LLC 516J TEKONSHA MI
2021-12-21 517-344-9XXX 9000–9999Assigned BOOST SUBSCRIBERCO L.L.C. 490J JACKSON MI
2021-12-20 517-274-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C SHAFTSBURG MI
2021-12-20 517-274-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C SHAFTSBURG MI
2021-12-20 517-274-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H SHAFTSBURG MI
2021-12-20 517-274-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H SHAFTSBURG MI
2021-12-20 517-633-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H ADRIAN MI
2021-12-20 517-633-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H ADRIAN MI
2021-12-20 517-817-5XXX 5000–5999Assigned BOOST SUBSCRIBERCO L.L.C. 490J JACKSON MI
2021-12-17 517-247-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-462-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-736-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-781-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-781-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-800-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-800-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-800-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-15 517-400-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-400-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-14 517-246-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C LANSING MI
2021-12-14 517-246-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LANSING MI
2021-12-14 517-246-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LANSING MI
2021-12-14 517-246-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C LANSING MI
2021-12-14 517-326-9XXX 9000–9999Assigned BOOST SUBSCRIBERCO L.L.C. 490J LANSING MI
2021-12-14 517-378-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTTERVL MI
2021-12-14 517-378-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTTERVL MI
2021-12-14 517-378-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTTERVL MI
2021-12-14 517-378-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTTERVL MI
2021-12-07 517-297-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2021-12-07 517-297-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2021-12-07 517-297-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2021-12-06 517-257-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2021-12-06 517-257-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2021-12-02 517-440-2XXX 2000–2999Assigned NUSO, LLC 478J LANSING MI
2021-12-02 517-929-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E HOMER MI
2021-11-24 517-633-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-11-24 517-633-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-11-17 517-705-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BURLINGTON MI
2021-11-15 517-271-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2021-11-12 517-516-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H ONSTED MI
2021-11-05 517-239-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DE WITT MI
2021-11-05 517-239-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DE WITT MI
2021-11-05 517-261-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H GRANDLEDGE MI
2021-11-05 517-261-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H GRANDLEDGE MI
2021-11-01 517-291-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN 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.