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
2010-09-28 517-798-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2010-08-27 517-438-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ADRIAN MI
2010-08-27 517-993-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2010-08-27 517-993-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2010-08-20 517-366-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
2010-08-09 517-798-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HOWELL MI
2010-08-05 517-915-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2010-08-05 517-975-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LANSING MI
2010-08-05 517-975-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LANSING MI
2010-08-02 517-292-9XXX 9000–9999Assigned METROPCS, INC. 5562 HOWELL MI
2010-08-02 517-610-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2010-07-30 517-348-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-348-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-348-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-348-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-574-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-574-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-574-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-07-30 517-731-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRANDLEDGE MI
2010-07-28 517-213-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CHARLOTTE MI
2010-07-23 517-219-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FOWLERVL MI
2010-07-23 517-219-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FOWLERVL MI
2010-07-23 517-580-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2010-07-14 517-348-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2010-07-14 517-376-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2010-07-14 517-618-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2010-07-09 517-677-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 COLDWATER MI
2010-06-09 517-748-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K JACKSON MI
2010-06-01 517-292-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 HOWELL MI
2010-05-27 517-566-6XXX 6000–6999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L SUNFIELD MI
2010-05-26 517-412-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E GRANDLEDGE MI
2010-05-20 517-607-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSDALE MI
2010-05-17 517-215-8XXX 8000–8999Assigned METROPCS, INC. 5562 ADRIAN MI
2010-05-14 517-227-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLDWATER MI
2010-05-12 517-215-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2010-05-12 517-445-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CLAYTON MI
2010-05-11 517-240-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-11 517-240-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2010-05-03 517-240-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2010-05-03 517-240-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2010-04-30 517-861-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 HOWELL MI
2010-04-30 517-861-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 HOWELL MI
2010-04-26 517-215-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2010-04-26 517-215-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2010-04-26 517-499-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 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.