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
2012-05-22 517-270-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
2012-05-21 517-366-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ADRIAN MI
2012-05-18 517-721-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2012-05-17 517-258-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2012-05-15 517-983-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L CHARLOTTE MI
2012-05-03 517-412-7XXX 7000–7999Assigned WOW! INTERNET, CABLE AND PHONE 961J GRANDLEDGE MI
2012-05-03 517-459-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J PARMA MI
2012-05-03 517-624-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J DE WITT MI
2012-05-03 517-890-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J HANOVER MI
2012-05-03 517-903-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J BATH MI
2012-05-03 517-910-4XXX 4000–4999Assigned WOW! INTERNET, CABLE AND PHONE 961J ONONDAGA MI
2012-05-03 517-919-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J LAINGSBURG MI
2012-05-03 517-926-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J GRASS LAKE MI
2012-05-03 517-929-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J HOMER MI
2012-05-03 517-984-5XXX 5000–5999Assigned WOW! INTERNET, CABLE AND PHONE 961J WEBBERVL MI
2012-05-03 517-985-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J STOCKBDG MI
2012-05-03 517-996-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J WILLIAMSTN MI
2012-05-02 517-224-8XXX 8000–8999Assigned WOW! INTERNET, CABLE AND PHONE 961J POTTERVL MI
2012-05-02 517-235-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J DIMONDALE MI
2012-05-02 517-325-1XXX 1000–1999Assigned WOW! INTERNET, CABLE AND PHONE 961J LANSING MI
2012-05-02 517-604-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J MASON MI
2012-05-02 517-709-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J HOLT MI
2012-05-02 517-715-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J FOWLERVL MI
2012-05-02 517-741-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J UNION CITY MI
2012-05-02 517-748-2XXX 2000–2999Assigned WOW! INTERNET, CABLE AND PHONE 961J JACKSON MI
2012-05-02 517-836-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J EATON RPD MI
2012-05-02 517-878-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J LESLIE MI
2012-05-02 517-895-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J CONCORD MI
2012-05-02 517-900-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J BUNDY HILL MI
2012-05-02 517-909-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J DANSVILLE MI
2012-05-02 517-948-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J MULLIKEN MI
2012-05-02 517-994-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J PORTLAND MI
2012-05-02 517-997-6XXX 6000–6999Assigned WOW! INTERNET, CABLE AND PHONE 961J CHARLOTTE MI
2012-05-01 517-645-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2012-05-01 517-649-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MULLIKEN MI
2012-05-01 517-684-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C NAPOLEON MI
2012-05-01 517-726-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C VERMONTVL MI
2012-05-01 517-760-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2012-05-01 517-826-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C JONESVILLE MI
2012-05-01 517-878-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C LESLIE MI
2012-05-01 517-883-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MASON MI
2012-05-01 517-994-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C PORTLAND MI
2012-04-04 517-343-2XXX 2000–2999Assigned WOW! INTERNET, CABLE AND PHONE 961J ALBION MI
2012-03-27 517-513-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2012-03-15 517-258-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2012-03-07 517-445-3XXX 3000–3999Assigned DEERFIELD FARMERS' TELEPHONE COMPANY - MI 558A CLAYTON MI
2012-02-23 517-317-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 COLDWATER MI
2012-02-22 517-932-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ALLEN MI
2012-02-21 517-513-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2012-02-10 517-513-5XXX 5000–5999Assigned METROPCS, INC. 5562 JACKSON 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.