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
2014-04-24 517-205-7XXX 7000–7999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-8XXX 8000–8999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-9XXX 9000–9999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-17 517-731-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRANDLEDGE MI
2014-04-11 517-554-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ALBION MI
2014-04-08 517-253-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2014-03-28 517-577-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ADRIAN MI
2014-03-28 517-662-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J ADRIAN MI
2014-03-27 517-481-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-03-21 517-366-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2014-03-21 517-815-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C TECUMSEH MI
2014-03-14 517-208-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRITTON MI
2014-03-14 517-429-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HUDSON MI
2014-03-07 517-401-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MORENCI MI
2014-03-07 517-431-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TIPTON MI
2014-03-07 517-915-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2014-02-26 517-295-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2014-02-24 517-409-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BLISSFIELD MI
2014-02-24 517-701-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CLINTON MI
2014-02-07 517-435-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2014-02-04 517-883-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MASON MI
2014-01-28 517-295-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J HOWELL MI
2014-01-15 517-462-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E COLDWATER MI
2014-01-15 517-662-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ADRIAN MI
2014-01-10 517-366-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ADRIAN MI
2014-01-10 517-938-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BROOKLYN MI
2013-12-19 517-424-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J TECUMSEH MI
2013-12-19 517-607-0XXX 0000–0999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L HILLSDALE MI
2013-12-19 517-731-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GRANDLEDGE MI
2013-12-19 517-906-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J HOLT MI
2013-12-10 517-258-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G HOWELL MI
2013-12-10 517-301-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G TECUMSEH MI
2013-12-10 517-306-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G HUDSON MI
2013-12-10 517-366-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ADRIAN MI
2013-12-10 517-401-2XXX 2000–2999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G MORENCI MI
2013-12-10 517-409-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G BLISSFIELD MI
2013-12-10 517-436-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G SAND CREEK MI
2013-12-10 517-443-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G OGDEN CTR MI
2013-12-10 517-445-5XXX 5000–5999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G CLAYTON MI
2013-12-10 517-446-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ONSTED MI
2013-12-10 517-447-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DEERFIELD MI
2013-12-02 517-253-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2013-10-24 517-731-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRANDLEDGE MI
2013-10-24 517-731-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRANDLEDGE MI
2013-10-10 517-878-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C LESLIE MI
2013-10-04 517-435-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2013-09-05 517-936-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2013-08-23 517-253-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2013-07-31 517-797-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J HILLSDALE MI
2013-07-19 517-622-9XXX 9000–9999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L GRANDLEDGE 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.