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
2017-03-06 517-522-9XXX 9000–9999Assigned 123.NET, LLC 2550 GRASS LAKE MI
2017-03-03 517-377-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2017-03-03 517-481-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2017-03-03 517-897-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2017-03-01 517-867-9XXX 9000–9999Assigned METROPCS, INC. 5562 JACKSON MI
2017-01-31 517-325-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C LANSING MI
2017-01-31 517-726-8XXX 8000–8999Assigned 123.NET, LLC 2550 VERMONTVL MI
2017-01-30 517-910-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ONONDAGA MI
2017-01-23 517-888-6XXX 6000–6999Assigned METROPCS, INC. 5562 JACKSON MI
2017-01-18 517-377-5XXX 5000–5999Assigned METROPCS, INC. 5562 LANSING MI
2017-01-18 517-377-6XXX 6000–6999Assigned METROPCS, INC. 5562 LANSING MI
2017-01-11 517-234-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2017-01-11 517-234-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2017-01-11 517-234-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2017-01-09 517-626-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDLEDGE MI
2016-12-07 517-342-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
2016-11-09 517-858-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BRONSON MI
2016-11-08 517-234-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2016-11-08 517-234-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2016-11-04 517-225-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2016-10-31 517-317-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLDWATER MI
2016-10-18 517-318-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2016-10-14 517-442-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
2016-10-13 517-236-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DIMONDALE MI
2016-10-12 517-319-7XXX 7000–7999Assigned METROPCS, INC. 5562 LANSING MI
2016-09-28 517-930-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
2016-09-14 517-604-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MASON MI
2016-09-13 517-702-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2016-09-13 517-721-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2016-08-26 517-897-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
2016-08-23 517-220-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2016-08-23 517-220-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2016-08-23 517-220-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2016-08-23 517-220-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2016-08-22 517-664-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C LANSING MI
2016-08-10 517-225-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2016-08-05 517-867-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2016-08-04 517-992-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WILLIAMSTN MI
2016-08-01 517-220-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LANSING MI
2016-07-19 517-221-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-221-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLT MI
2016-07-19 517-236-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2016-07-19 517-236-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE 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.