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
2021-06-11 517-296-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C MONTGOMERY MI
2021-06-11 517-695-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C RANSOM MI
2021-06-11 517-696-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C PRATTVILLE MI
2021-06-11 517-698-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C NORTHADAMS MI
2021-06-11 517-790-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C MOSHERVL MI
2021-06-11 517-878-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-06-11 517-890-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C HANOVER MI
2021-06-11 517-890-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HANOVER MI
2021-06-11 517-891-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FRONTIER MI
2021-06-11 517-895-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C CONCORD MI
2021-06-11 517-895-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CONCORD MI
2021-06-11 517-900-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BUNDY HILL MI
2021-06-11 517-932-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ALLEN MI
2021-06-11 517-938-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BROOKLYN MI
2021-06-11 517-938-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C BROOKLYN MI
2021-06-11 517-946-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CAMBRIA MI
2021-06-11 517-991-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CAMDEN MI
2021-05-20 517-201-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-05-20 517-201-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-05-20 517-210-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2021-05-20 517-296-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MONTGOMERY MI
2021-05-20 517-409-8XXX 8000–8999Assigned TWILIO INTERNATIONAL, INC. 506J BLISSFIELD MI
2021-05-20 517-457-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C TIPTON MI
2021-05-20 517-516-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H ONSTED MI
2021-05-20 517-594-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C OSSEO MI
2021-05-20 517-695-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C RANSOM MI
2021-05-20 517-696-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C PRATTVILLE MI
2021-05-20 517-698-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C NORTHADAMS MI
2021-05-20 517-701-9XXX 9000–9999Assigned TWILIO INTERNATIONAL, INC. 506J CLINTON MI
2021-05-20 517-736-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-05-20 517-790-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MOSHERVL MI
2021-05-19 517-201-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H LESLIE MI
2021-05-19 517-210-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H POTTERVL MI
2021-05-19 517-271-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H NASHVILLE MI
2021-05-19 517-418-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H HOMER MI
2021-05-19 517-459-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H PARMA MI
2021-05-19 517-500-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H SUNFIELD MI
2021-05-19 517-521-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H WEBBERVL MI
2021-05-19 517-557-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BRITTON MI
2021-05-19 517-569-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H RIVES JCT MI
2021-05-19 517-615-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H VERMONTVL MI
2021-05-19 517-697-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H PERRY MI
2021-05-19 517-705-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BURLINGTON MI
2021-05-19 517-732-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H PORTLAND MI
2021-05-19 517-790-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H MOSHERVL MI
2021-05-19 517-800-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-05-19 517-826-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H JONESVILLE MI
2021-05-19 517-877-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H LITCHFIELD MI
2021-05-19 517-901-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H READING MI
2021-05-19 517-910-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H ONONDAGA 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.