NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

7 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 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
2016-02-23 231-803-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MORLEY MI
2016-02-23 231-803-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MORLEY MI
2016-02-19 231-216-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2016-02-19 231-216-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2016-02-19 231-259-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E SHELBY MI
2016-02-19 231-570-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FIFE LAKE MI
2016-02-19 231-570-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C FIFE LAKE MI
2016-02-19 231-625-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CHEBOYGAN MI
2016-02-19 231-674-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C GRANT MI
2016-02-19 231-834-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C GRANT MI
2016-02-19 231-936-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C SCOTTVILLE MI
2016-02-19 231-936-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C SCOTTVILLE MI
2016-02-17 231-489-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C PETOSKEY MI
2016-02-17 231-489-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C PETOSKEY MI
2016-02-17 231-624-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C KALKASKA MI
2016-02-17 231-886-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C KALKASKA MI
2016-02-16 231-292-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C WHITEHALL MI
2016-02-16 231-292-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C WHITEHALL MI
2016-02-16 231-655-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MANISTEE MI
2016-02-16 231-655-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C MANISTEE MI
2016-02-12 231-259-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C SHELBY MI
2016-02-12 231-259-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 SHELBY MI
2016-02-12 231-259-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C SHELBY MI
2016-02-12 231-408-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2016-02-12 231-408-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2016-02-12 231-447-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C HOLTON MI
2016-02-12 231-447-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HOLTON MI
2016-02-12 231-465-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 REED CITY MI
2016-02-12 231-533-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C BELLAIRE MI
2016-02-12 231-625-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C CHEBOYGAN MI
2016-02-12 231-625-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CHEBOYGAN MI
2016-02-12 231-888-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C TWIN LAKE MI
2016-02-12 231-888-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C TWIN LAKE MI
2016-02-10 231-244-0XXX 0000–0999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G BOYNE CITY MI
2016-02-10 231-444-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C CADILLAC MI
2016-02-10 231-444-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C CADILLAC MI
2016-02-03 231-360-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2016-02-03 231-715-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2016-01-26 231-538-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2016-01-26 231-538-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2016-01-11 231-292-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHITEHALL MI
2015-12-24 231-259-2XXX 2000–2999Assigned 123.NET, LLC 2550 SHELBY MI
2015-12-23 231-246-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2015-12-08 231-234-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BUCKLEY MI
2015-12-08 231-251-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G LKLEELANAU MI
2015-12-08 231-447-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C HOLTON MI
2015-12-08 231-447-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C HOLTON MI
2015-12-07 231-599-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2015-12-07 231-599-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2015-12-07 231-638-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MUSKEGON 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.