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
2013-03-01 231-404-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K STANWOOD MI
2013-02-22 231-256-4XXX 4000–4999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L LKLEELANAU MI
2013-02-20 231-241-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C PENTWATER MI
2013-02-20 231-259-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C SHELBY MI
2013-02-20 231-292-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C WHITEHALL MI
2013-02-20 231-303-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C NEWAYGO MI
2013-02-20 231-307-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MORLEY MI
2013-02-20 231-322-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C TRCHRIVBDG MI
2013-02-20 231-386-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C NORTHPORT MI
2013-02-20 231-403-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C WILLIAMSBG MI
2013-02-20 231-508-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ONEKAMA MI
2013-02-20 231-525-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C WOLVERINE MI
2013-02-20 231-539-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C PELLSTON MI
2013-02-20 231-559-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C MCBAIN MI
2013-02-20 231-642-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C TRAVERSECY MI
2013-02-20 231-689-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C WHITECLOUD MI
2013-02-20 231-758-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C PETOSKEY MI
2013-02-20 231-766-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2013-02-20 231-823-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C STANWOOD MI
2013-02-20 231-828-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C TWIN LAKE MI
2013-02-20 231-872-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C REED CITY MI
2013-02-20 231-936-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C SCOTTVILLE MI
2013-02-19 231-239-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C LUDINGTON MI
2013-02-19 231-266-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C IRONS MI
2013-02-19 231-290-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C INDIAN RIV MI
2013-02-19 231-299-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MANISTEE MI
2013-02-19 231-366-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C FRUITPORT MI
2013-02-19 231-389-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HARRIETTA MI
2013-02-19 231-412-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C HARBOR SPG MI
2013-02-19 231-427-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MACKINAWCY MI
2013-02-19 231-450-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2013-02-19 231-587-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MANCELONA MI
2013-02-19 231-624-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C KALKASKA MI
2013-02-19 231-636-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HOWARDCITY MI
2013-02-19 231-742-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C HART MI
2013-02-19 231-743-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MARION MI
2013-02-19 231-768-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LE ROY MI
2013-02-19 231-774-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C INTERLOCHN MI
2013-02-19 231-797-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LUTHER MI
2013-02-19 231-821-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HOLTON MI
2013-02-19 231-928-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2013-02-19 231-994-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C LKLEELANAU MI
2013-02-08 231-480-2XXX 2000–2999Assigned FRONTIER NORTH, INC. - MI 0695 LUDINGTON MI
2013-01-28 231-729-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C IRONS MI
2013-01-28 231-916-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C MANCELONA MI
2013-01-25 231-559-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MCBAIN MI
2013-01-11 231-726-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-01-09 231-598-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIG RAPIDS MI
2012-12-14 231-338-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BALDWIN MI
2012-12-14 231-767-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E 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.