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
2014-11-13 517-868-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-13 517-868-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-13 517-868-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-13 517-868-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-11-05 517-435-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2014-10-16 517-997-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CHARLOTTE MI
2014-10-06 517-940-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LANSING MI
2014-10-06 517-940-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C LANSING MI
2014-10-02 517-513-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2014-10-01 517-336-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-09-25 517-732-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2014-09-16 517-826-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C JONESVILLE MI
2014-09-16 517-826-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C JONESVILLE MI
2014-09-05 517-657-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LANSING MI
2014-08-26 517-708-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C LANSING MI
2014-08-22 517-301-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TECUMSEH MI
2014-08-21 517-435-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2014-08-06 517-435-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2014-08-06 517-715-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2014-07-29 517-435-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2014-07-29 517-940-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LANSING MI
2014-07-14 517-213-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CHARLOTTE MI
2014-06-27 517-295-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2014-06-16 517-235-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-235-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-408-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-408-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-408-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-408-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-408-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-868-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-868-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-16 517-868-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DIMONDALE MI
2014-06-12 517-295-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HOWELL MI
2014-06-10 517-295-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2014-06-10 517-295-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2014-06-04 517-253-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-06-02 517-457-2XXX 2000–2999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G TIPTON MI
2014-05-27 517-208-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G BRITTON MI
2014-05-21 517-580-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2014-05-16 517-295-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOWELL MI
2014-05-13 517-796-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J JACKSON MI
2014-05-06 517-295-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2014-04-24 517-205-0XXX 0000–0999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-1XXX 1000–1999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-2XXX 2000–2999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-3XXX 3000–3999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-4XXX 4000–4999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-5XXX 5000–5999Assigned MICHIGAN BELL TEL CO 9323 JACKSON MI
2014-04-24 517-205-6XXX 6000–6999Assigned MICHIGAN BELL TEL CO 9323 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.