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
2012-02-10 517-703-3XXX 3000–3999Assigned METROPCS, INC. 5562 LANSING MI
2012-02-08 517-209-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J HOLT MI
2012-02-08 517-836-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C EATON RPD MI
2012-02-03 517-235-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DIMONDALE MI
2012-02-03 517-513-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2012-02-03 517-715-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C FOWLERVL MI
2012-02-03 517-742-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HOLT MI
2012-02-03 517-797-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HILLSDALE MI
2012-02-02 517-465-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ALBION MI
2012-02-02 517-667-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C CHARLOTTE MI
2012-02-02 517-909-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DANSVILLE MI
2012-01-31 517-798-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOWELL MI
2012-01-30 517-366-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2012-01-25 517-624-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DE WITT MI
2012-01-11 517-703-7XXX 7000–7999Assigned METROPCS, INC. 5562 LANSING MI
2012-01-06 517-667-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CHARLOTTE MI
2012-01-05 517-798-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2011-12-19 517-715-7XXX 7000–7999Assigned METROPCS, INC. 5562 FOWLERVL MI
2011-12-14 517-936-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2011-12-13 517-334-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LANSING MI
2011-12-07 517-836-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L EATON RPD MI
2011-12-01 517-209-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L HOLT MI
2011-12-01 517-480-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L STOCKBDG MI
2011-11-22 517-924-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K COLDWATER MI
2011-11-09 517-575-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2011-11-04 517-250-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-11-04 517-315-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-11-04 517-358-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-11-04 517-358-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-11-04 517-395-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-10-13 517-662-2XXX 2000–2999Assigned METROPCS, INC. 5562 ADRIAN MI
2011-10-10 517-492-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-492-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-512-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-582-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-582-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-582-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-643-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-643-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2011-10-10 517-706-8XXX 8000–8999Assigned METROPCS, INC. 5562 LANSING MI
2011-09-29 517-443-4XXX 4000–4999Assigned TC3 TELECOM, INC. - MI 3459 OGDEN CTR MI
2011-09-20 517-224-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C POTTERVL MI
2011-09-20 517-305-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C CLARKLAKE MI
2011-09-20 517-441-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C EATON RPD MI
2011-09-20 517-615-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C VERMONTVL MI
2011-09-20 517-684-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NAPOLEON MI
2011-09-20 517-715-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FOWLERVL MI
2011-09-20 517-797-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C HILLSDALE MI
2011-09-20 517-852-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C NASHVILLE MI
2011-09-20 517-883-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MASON 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.