NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

Most active assignees, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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 NPA-NXX prefix assignments
AssignedNPA-NXXAssigneeOCNRate centerState
231-759 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-760 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-762 MICHIGAN CENTRAL BROADBAND COMPANY, LLC 785G AMBLE MI
231-766 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-767 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-768 MICHIGAN BELL TEL CO 9323 LE ROY MI
231-769 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-773 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-775 MICHIGAN BELL TEL CO 9323 CADILLAC MI
231-777 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-779 MICHIGAN BELL TEL CO 9323 CADILLAC MI
231-780 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-788 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-793 AT&T ENTERPRISES, LLC 516C WHITECLOUD MI
231-796 MICHIGAN BELL TEL CO 9323 BIG RAPIDS MI
231-797 MICHIGAN BELL TEL CO 9323 LUTHER MI
231-798 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-799 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-810 MI
231-811 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-813 123.NET, LLC 2550 LUDINGTON MI
231-818 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
231-821 FRONTIER NORTH, INC. - MI 0695 HOLTON MI
231-823 FRONTIER NORTH, INC. - MI 0695 STANWOOD MI
231-824 MICHIGAN BELL TEL CO 9323 MANTON MI
231-825 MICHIGAN BELL TEL CO 9323 MCBAIN MI
231-826 BRIGHTSPEED OF NORTHERN MICHIGAN, INC 0705 FALMOUTH MI
231-828 FRONTIER NORTH, INC. - MI 0695 TWIN LAKE MI
231-829 MICHIGAN BELL TEL CO 9323 TUSTIN MI
231-830 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-831 ONVOY, LLCV - MI 543C EASTJORDAN MI
231-832 MICHIGAN BELL TEL CO 9323 REED CITY MI
231-834 MICHIGAN BELL TEL CO 9323 GRANT MI
231-837 AMERICAN MESSAGING SERVICES, LLC 9748 FREMONT MI
231-839 BRIGHTSPEED OF MICHIGAN, LLC 0702 LAKE CITY MI
231-843 FRONTIER NORTH, INC. - MI 0695 LUDINGTON MI
231-845 FRONTIER NORTH, INC. - MI 0695 LUDINGTON MI
231-846 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CADILLAC MI
231-848 KALEVA TEL. CO. 0703 WELLSTON MI
231-852 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
231-853 FRONTIER NORTH, INC. - MI 0695 RAVENNA MI
231-854 FRONTIER NORTH, INC. - MI 0695 HESPERIA MI
231-855 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-856 MICHIGAN BELL TEL CO 9323 MORLEY MI
231-859 KALEVA TEL. CO. 0703 DUBLIN MI
231-861 FRONTIER NORTH, INC. - MI 0695 SHELBY MI
231-862 ACE TEL. CO. OF MICHIGAN, INC. 0704 HOXEYVILLE MI
231-864 BRIGHTSPEED OF MICHIGAN, LLC 0702 BEAR LAKE MI
231-865 FRONTIER NORTH, INC. - MI 0695 FRUITPORT MI
231-867 BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 CHIPPEWALK MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.