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)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

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-NXXThousands-blocks — who really holds the numbersCode holderOCNRate centerState
— 231-759 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-760 9 of 10 blocks assigned · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-762 Not yet reported which blocks → MICHIGAN CENTRAL BROADBAND COMPANY, LLC 785G AMBLE MI
— 231-766 4 of 10 blocks assigned · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-767 2 of 10 blocks assigned · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-768 7 of 10 blocks assigned · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 LE ROY MI
— 231-769 9 of 10 blocks assigned · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-773 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-775 Not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CADILLAC MI
— 231-777 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-779 Not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CADILLAC MI
— 231-780 2 of 10 blocks assigned · 1 holder which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-788 2 of 10 blocks assigned · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-793 2 of 10 blocks assigned · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C WHITECLOUD MI
— 231-796 Not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIG RAPIDS MI
— 231-797 9 of 10 blocks assigned · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 LUTHER MI
— 231-798 1 of 10 blocks assigned · 1 holder which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-799 1 of 10 blocks assigned · 1 holder which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-810 Not yet reported which blocks → MI
— 231-811 Not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 231-813 Not yet reported which blocks → 123.NET, LLC 2550 LUDINGTON MI
— 231-818 7 of 10 blocks assigned · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
— 231-821 6 of 10 blocks assigned · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HOLTON MI
— 231-823 4 of 10 blocks assigned · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 STANWOOD MI
— 231-824 7 of 10 blocks assigned · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 MANTON MI
— 231-825 5 of 10 blocks assigned · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 MCBAIN MI
— 231-826 1 of 10 blocks assigned · 1 holder which blocks → BRIGHTSPEED OF NORTHERN MICHIGAN, INC 0705 FALMOUTH MI
— 231-828 7 of 10 blocks assigned · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 TWIN LAKE MI
— 231-829 8 of 10 blocks assigned · 7 holders which blocks → MICHIGAN BELL TEL CO 9323 TUSTIN MI
— 231-830 4 of 10 blocks assigned · 1 holder which blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-831 6 of 10 blocks assigned · 4 holders which blocks → ONVOY, LLCV - MI 543C EASTJORDAN MI
— 231-832 Not yet reported which blocks → MICHIGAN BELL TEL CO 9323 REED CITY MI
— 231-834 4 of 10 blocks assigned · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 GRANT MI
— 231-837 Not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FREMONT MI
— 231-839 Not yet reported which blocks → BRIGHTSPEED OF MICHIGAN, LLC 0702 LAKE CITY MI
— 231-843 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 LUDINGTON MI
— 231-845 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 LUDINGTON MI
— 231-846 8 of 10 blocks assigned · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CADILLAC MI
— 231-848 Not yet reported which blocks → KALEVA TEL. CO. 0703 WELLSTON MI
— 231-852 4 of 10 blocks assigned · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
— 231-853 5 of 10 blocks assigned · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 RAVENNA MI
— 231-854 Not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 HESPERIA MI
— 231-855 6 of 10 blocks assigned · 1 holder which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
— 231-856 4 of 10 blocks assigned · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 MORLEY MI
— 231-859 Not yet reported which blocks → KALEVA TEL. CO. 0703 DUBLIN MI
— 231-861 2 of 10 blocks assigned · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SHELBY MI
— 231-862 1 of 10 blocks assigned · 1 holder which blocks → ACE TEL. CO. OF MICHIGAN, INC. 0704 HOXEYVILLE MI
— 231-864 Not yet reported which blocks → BRIGHTSPEED OF MICHIGAN, LLC 0702 BEAR LAKE MI
— 231-865 1 of 10 blocks assigned · 1 holder which blocks → FRONTIER NORTH, INC. - MI 0695 FRUITPORT MI
— 231-867 6 of 10 blocks assigned · 4 holders which blocks → 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.