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
231-869 FRONTIER NORTH, INC. - MI 0695 PENTWATER MI
231-871 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEULAH MI
231-872 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
231-873 FRONTIER NORTH, INC. - MI 0695 HART MI
231-875 BANDWIDTH.COM CLEC, LLC - MI 991E FRUITPORT MI
231-876 MICHIGAN BELL TEL CO 9323 CADILLAC MI
231-877 123.NET, LLC 2550 NORTHPORT MI
231-879 MICHIGAN BELL TEL CO 9323 FIFE LAKE MI
231-881 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
231-882 MICHIGAN BELL TEL CO 9323 BEULAH MI
231-883 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-884 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
231-885 ACE TEL. CO. OF MICHIGAN, INC. 0704 MESICK MI
231-886 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KALKASKA MI
231-887 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANISTEE MI
231-889 MICHIGAN BELL TEL CO 9323 ONEKAMA MI
231-890 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-893 FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
231-894 FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
231-898 CARR TEL. CO. 0683 CARR MI
231-906 MI
231-911 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-920 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
231-922 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-924 MICHIGAN BELL TEL CO 9323 FREMONT MI
231-928 MICHIGAN BELL TEL CO 9323 FREMONT MI
231-929 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-932 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-933 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-935 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-937 FRONTIER NORTH, INC. - MI 0695 HOWARDCITY MI
231-938 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-941 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-943 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-944 CYNERGYCOMM.NET, INC. - MI 9245 TRAVERSECY MI
231-946 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-947 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
231-950 MI
231-955 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-958 MI
231-959 MI
231-972 BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 MECOSTA MI
231-976 MI
231-981 FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
231-988 MI
231-989 MI
231-995 MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
234-211 MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
234-256 ONVOY, LLC - OH 464C HUBBARD OH
234-260 AIRESPRING, INC. 996H AKRON OH

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.