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
2011-09-20 517-955-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C DANSVILLE MI
2011-09-20 517-983-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHARLOTTE MI
2011-09-20 517-995-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C JONESVILLE MI
2011-09-02 517-458-5XXX 5000–5999Assigned 123.NET, LLC 2550 MORENCI MI
2011-09-01 517-462-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 COLDWATER MI
2011-09-01 517-662-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ADRIAN MI
2011-08-31 517-317-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLDWATER MI
2011-08-29 517-315-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2011-08-29 517-431-1XXX 1000–1999Assigned DEERFIELD FARMERS' TELEPHONE COMPANY - MI 558A TIPTON MI
2011-08-29 517-436-2XXX 2000–2999Assigned DEERFIELD FARMERS' TELEPHONE COMPANY - MI 558A SAND CREEK MI
2011-08-29 517-443-2XXX 2000–2999Assigned DEERFIELD FARMERS' TELEPHONE COMPANY - MI 558A OGDEN CTR MI
2011-08-19 517-212-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSDALE MI
2011-08-11 517-284-0XXX 0000–0999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-1XXX 1000–1999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-2XXX 2000–2999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-3XXX 3000–3999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-4XXX 4000–4999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-5XXX 5000–5999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-6XXX 6000–6999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-7XXX 7000–7999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-8XXX 8000–8999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-11 517-284-9XXX 9000–9999Assigned MICHIGAN BELL TEL CO 9323 LANSING MI
2011-08-08 517-512-2XXX 2000–2999Assigned METROPCS, INC. 5562 LANSING MI
2011-08-08 517-512-8XXX 8000–8999Assigned METROPCS, INC. 5562 LANSING MI
2011-08-03 517-526-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2011-07-22 517-798-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2011-07-11 517-715-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2011-06-09 517-203-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2011-06-08 517-908-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2011-06-07 517-512-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LANSING MI
2011-06-03 517-252-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADDISON MI
2011-06-03 517-568-9XXX 9000–9999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L HOMER MI
2011-05-25 517-526-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PORTLAND MI
2011-05-20 517-883-9XXX 9000–9999Assigned 123.NET, LLC 2550 MASON MI
2011-05-18 517-526-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C PORTLAND MI
2011-05-06 517-664-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C LANSING MI
2011-04-08 517-213-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CHARLOTTE MI
2011-03-29 517-721-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2011-03-21 517-798-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2011-03-21 517-798-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2011-03-16 517-607-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSDALE MI
2011-03-09 517-317-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLDWATER MI
2011-02-28 517-512-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LANSING MI
2011-02-18 517-227-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 COLDWATER MI
2011-02-10 517-212-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HILLSDALE MI
2011-02-07 517-358-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-02-07 517-358-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-02-07 517-358-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-02-07 517-358-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2011-02-07 517-358-8XXX 8000–8999Assigned 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.