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
2021-08-11 517-271-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2021-08-09 517-510-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CLAYTON MI
2021-08-03 517-280-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-08-03 517-280-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2021-07-29 517-293-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-07-29 517-293-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2021-07-26 517-210-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2021-07-22 517-537-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-07-22 517-537-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-07-22 517-537-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-07-22 517-537-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-07-21 517-800-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2021-07-21 517-800-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2021-07-21 517-800-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2021-07-21 517-800-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2021-07-19 517-891-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C FRONTIER MI
2021-07-19 517-900-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C BUNDY HILL MI
2021-07-19 517-932-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ALLEN MI
2021-07-19 517-946-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CAMBRIA MI
2021-07-06 517-271-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2021-07-01 517-274-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H SHAFTSBURG MI
2021-07-01 517-596-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H MUNITH MI
2021-06-30 517-276-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H HUDSON MI
2021-06-28 517-428-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2021-06-25 517-274-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C SHAFTSBURG MI
2021-06-25 517-276-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HUDSON MI
2021-06-23 517-514-9XXX 9000–9999Assigned METROPCS, INC. 5562 CLINTON MI
2021-06-17 517-280-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ADRIAN MI
2021-06-15 517-662-6XXX 6000–6999Assigned TERRA NOVA TELECOM INC. 145J ADRIAN MI
2021-06-15 517-756-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C UNION CITY MI
2021-06-15 517-774-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C COLDWTR LK MI
2021-06-15 517-858-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C BRONSON MI
2021-06-14 517-457-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C TIPTON MI
2021-06-14 517-510-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CLAYTON MI
2021-06-14 517-516-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ONSTED MI
2021-06-14 517-516-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ONSTED MI
2021-06-14 517-537-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-06-14 517-537-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-06-14 517-537-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-06-14 517-537-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2021-06-14 517-557-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C BRITTON MI
2021-06-14 517-569-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C RIVES JCT MI
2021-06-14 517-594-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C OSSEO MI
2021-06-11 517-210-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2021-06-11 517-216-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-06-11 517-216-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-06-11 517-216-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-06-11 517-216-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-06-11 517-216-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-06-11 517-216-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H LANSING 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.