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
2021-02-03 517-201-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-02-03 517-201-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-02-03 517-210-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2021-02-03 517-210-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2021-02-03 517-280-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-02-03 517-280-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-02-03 517-398-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HILLSDALE MI
2021-02-03 517-441-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C EATON RPD MI
2021-02-03 517-441-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C EATON RPD MI
2021-02-03 517-536-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C NAPOLEON MI
2021-02-03 517-536-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H NAPOLEON MI
2021-02-03 517-666-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C GRANDLEDGE MI
2021-02-03 517-666-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C GRANDLEDGE MI
2021-02-03 517-701-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CLINTON MI
2021-02-03 517-701-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CLINTON MI
2021-02-03 517-732-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C PORTLAND MI
2021-02-03 517-732-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C PORTLAND MI
2021-02-03 517-758-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C HOLT MI
2021-02-03 517-758-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C HOLT MI
2021-02-03 517-797-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C HILLSDALE MI
2021-02-03 517-901-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C READING MI
2021-02-03 517-901-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C READING MI
2021-02-03 517-903-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C BATH MI
2021-02-03 517-903-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C BATH MI
2021-02-03 517-907-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CLARKLAKE MI
2021-02-03 517-907-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CLARKLAKE MI
2021-02-03 517-910-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ONONDAGA MI
2021-02-03 517-910-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ONONDAGA MI
2021-02-03 517-919-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LAINGSBURG MI
2021-02-03 517-919-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LAINGSBURG MI
2021-02-03 517-928-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MASON MI
2021-02-03 517-969-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MASON MI
2021-02-03 517-984-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C WEBBERVL MI
2021-02-03 517-984-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C WEBBERVL MI
2021-02-03 517-996-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C WILLIAMSTN MI
2021-02-03 517-996-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C WILLIAMSTN MI
2021-01-29 517-328-1XXX 1000–1999Assigned IP HORIZON LLC 515J LANSING MI
2021-01-20 517-280-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2021-01-20 517-280-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2021-01-20 517-280-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2021-01-14 517-312-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2021-01-14 517-312-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2021-01-12 517-885-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2021-01-11 517-329-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2021-01-11 517-329-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2021-01-07 517-428-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2021-01-05 517-924-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C COLDWATER MI
2021-01-05 517-924-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C COLDWATER MI
2021-01-04 517-208-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BRITTON MI
2021-01-04 517-208-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C BRITTON 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.