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
2020-04-08 517-429-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HUDSON MI
2020-04-07 517-400-0XXX 0000–0999Assigned FRACTEL, LLC 965H LANSING MI
2020-04-07 517-428-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2020-04-06 517-939-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E QUINCY MI
2020-04-02 517-858-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BRONSON MI
2020-04-01 517-289-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LANSING MI
2020-04-01 517-289-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C LANSING MI
2020-03-30 517-300-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ONSTED MI
2020-03-11 517-237-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2020-02-20 517-842-5XXX 5000–5999Assigned FRACTEL, LLC 965H GRASS LAKE MI
2020-02-19 517-443-7XXX 7000–7999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G OGDEN CTR MI
2020-02-19 517-446-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ONSTED MI
2020-01-27 517-208-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G BRITTON MI
2020-01-15 517-200-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C LITCHFIELD MI
2020-01-15 517-200-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LITCHFIELD MI
2020-01-15 517-903-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BATH MI
2020-01-15 517-903-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C BATH MI
2020-01-15 517-921-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ADDISON MI
2020-01-15 517-921-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ADDISON MI
2020-01-15 517-923-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FITCHBURG MI
2020-01-15 517-923-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C FITCHBURG MI
2020-01-14 517-815-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C TECUMSEH MI
2020-01-14 517-815-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C TECUMSEH MI
2020-01-09 517-701-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C CLINTON MI
2020-01-09 517-701-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C CLINTON MI
2020-01-06 517-312-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2020-01-06 517-312-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2020-01-02 517-928-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MASON MI
2019-12-18 517-200-2XXX 2000–2999Assigned FRACTEL, LLC 965H LITCHFIELD MI
2019-12-18 517-312-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
2019-12-17 517-662-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ADRIAN MI
2019-12-12 517-732-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2019-12-12 517-732-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORTLAND MI
2019-12-12 517-900-0XXX 0000–0999Assigned FRACTEL, LLC 965H BUNDY HILL MI
2019-11-26 517-758-6XXX 6000–6999Assigned FRACTEL, LLC 965H HOLT MI
2019-11-22 517-356-7XXX 7000–7999Assigned FRACTEL, LLC 965H LANSING MI
2019-11-22 517-356-9XXX 9000–9999Assigned FRACTEL, LLC 965H LANSING MI
2019-10-31 517-400-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2019-10-11 517-300-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ONSTED MI
2019-10-11 517-300-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ONSTED MI
2019-10-03 517-666-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J GRANDLEDGE MI
2019-10-03 517-730-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2019-10-03 517-730-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2019-09-27 517-577-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ADRIAN MI
2019-09-27 517-577-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ADRIAN 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.