NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 231
NEW CINGULAR WIRELESS PCS, LLC - IL 2
EXIANT COMMUNICATIONS LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
AHOI LLC 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
2023-07-07 231-500-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C WHITEHALL MI
2023-07-07 231-539-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C PELLSTON MI
2023-07-07 231-566-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C HARRIETTA MI
2023-07-07 231-594-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C HART MI
2023-07-07 231-680-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C REED CITY MI
2023-07-07 231-699-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2023-07-07 231-831-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C EASTJORDAN MI
2023-07-03 231-500-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WHITEHALL MI
2023-06-26 231-298-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G IRONS MI
2023-06-23 231-800-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K LUTHER MI
2023-06-13 231-410-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MANISTEE MI
2023-06-08 231-224-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2023-06-08 231-289-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C CHARLEVOIX MI
2023-06-08 231-297-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C KINGSLEY MI
2023-06-08 231-370-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-06-08 231-370-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-06-08 231-374-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C SHELBY MI
2023-06-08 231-396-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C CADILLAC MI
2023-06-08 231-410-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MANISTEE MI
2023-06-08 231-454-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2023-06-08 231-454-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2023-06-08 231-460-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2023-06-08 231-563-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-06-08 231-563-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-06-08 231-563-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-06-08 231-746-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C CHEBOYGAN MI
2023-05-25 231-643-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J MORLEY MI
2023-05-25 231-912-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J REED CITY MI
2023-05-23 231-880-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2023-05-23 231-880-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2023-05-05 231-594-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HART MI
2023-04-18 231-370-3XXX 3000–3999Assigned BOOST SUBSCRIBERCO L.L.C. 490J MUSKEGON MI
2023-04-05 231-566-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HARRIETTA MI
2023-03-29 231-278-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2023-03-29 231-293-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2023-03-29 231-400-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ALANSON MI
2023-03-29 231-422-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C PELLSTON MI
2023-03-29 231-455-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C PENTWATER MI
2023-03-29 231-495-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C BELLAIRE MI
2023-03-29 231-626-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LEVERING MI
2023-03-23 231-385-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CORAL MI
2023-03-10 231-402-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2023-03-07 231-289-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CHARLEVOIX MI
2023-03-07 231-297-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C KINGSLEY MI
2023-02-13 231-381-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WHITECLOUD MI
2023-02-08 231-772-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WELLSTON MI
2023-02-08 231-867-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CHIPPEWALK MI
2023-01-13 231-688-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MERRITT MI
2023-01-06 231-417-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PETOSKEY MI
2022-12-08 231-304-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C BRUTUS MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.