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
2015-08-18 517-777-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C HOLT MI
2015-08-18 517-777-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HOLT MI
2015-08-18 517-777-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HOLT MI
2015-08-18 517-888-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2015-08-18 517-888-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2015-08-18 517-888-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2015-08-13 517-462-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLDWATER MI
2015-08-13 517-494-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALBION MI
2015-08-13 517-774-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLDWTR LK MI
2015-08-12 517-858-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRONSON MI
2015-08-11 517-418-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOMER MI
2015-08-11 517-435-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L JACKSON MI
2015-08-05 517-852-7XXX 7000–7999Assigned 123.NET, LLC 2550 NASHVILLE MI
2015-07-30 517-539-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2015-07-29 517-706-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-07-20 517-539-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2015-07-20 517-539-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2015-07-20 517-657-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LANSING MI
2015-07-20 517-657-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LANSING MI
2015-07-20 517-657-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LANSING MI
2015-07-20 517-836-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J EATON RPD MI
2015-07-14 517-539-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2015-07-13 517-939-3XXX 3000–3999Assigned 123.NET, LLC 2550 QUINCY MI
2015-07-07 517-539-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 JACKSON MI
2015-07-02 517-539-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2015-06-23 517-940-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-06-16 517-657-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2015-06-15 517-657-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LANSING MI
2015-06-03 517-657-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2015-05-19 517-596-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MUNITH MI
2015-05-19 517-684-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NAPOLEON MI
2015-05-15 517-447-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DEERFIELD MI
2015-04-24 517-239-4XXX 4000–4999Assigned FRONTIER NORTH, INC. - MI 0695 DE WITT MI
2015-04-24 517-312-4XXX 4000–4999Assigned FRONTIER NORTH, INC. - MI 0695 ADRIAN MI
2015-04-08 517-597-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SUNFIELD MI
2015-04-03 517-539-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2015-04-01 517-940-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2015-03-17 517-539-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C JACKSON MI
2015-03-17 517-539-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2015-03-09 517-938-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BROOKLYN MI
2015-02-20 517-885-5XXX 5000–5999Assigned METROPCS, INC. 5562 LANSING MI
2015-01-26 517-334-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LANSING MI
2014-12-15 517-295-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2014-12-15 517-435-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2014-12-15 517-435-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2014-12-09 517-883-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MASON MI
2014-11-20 517-212-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J HILLSDALE MI
2014-11-13 517-868-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-13 517-868-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-13 517-868-5XXX 5000–5999Assigned 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.