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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXAssigneeOCNRate centerState
231-611 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-613 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SCOTTVILLE MI
231-614 123.NET, LLC 2550 PENTWATER MI
231-615 AMERICAN MESSAGING SERVICES, LLC 9748 CHEBOYGAN MI
231-616 MI
231-620 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-624 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
231-625 MICHIGAN BELL TEL CO 9323 CHEBOYGAN MI
231-627 MICHIGAN BELL TEL CO 9323 CHEBOYGAN MI
231-629 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BIG RAPIDS MI
231-632 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-633 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-634 ISLAND TEL. CO. 0677 BOIS BLANC MI
231-645 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-648 LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOWARDCITY MI
231-652 MICHIGAN BELL TEL CO 9323 NEWAYGO MI
231-689 MICHIGAN BELL TEL CO 9323 WHITECLOUD MI
231-700 MI
231-709 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-711 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-712 AMERICAN MESSAGING SERVICES, LLC 9748 MUSKEGON MI
231-714 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-715 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-719 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-720 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-722 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-723 MICHIGAN BELL TEL CO 9323 MANISTEE MI
231-724 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-725 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-726 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-727 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-728 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-730 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-731 123.NET, LLC 2550 SHELBY MI
231-732 ONVOY SPECTRUM, LLC 624H MORLEY MI
231-733 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-734 MICHIGAN BELL TEL CO 9323 EVART MI
231-736 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-737 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-739 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-740 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
231-742 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HART MI
231-743 MICHIGAN BELL TEL CO 9323 MARION MI
231-744 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-745 MICHIGAN BELL TEL CO 9323 BALDWIN MI
231-747 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-750 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-755 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-757 MICHIGAN BELL TEL CO 9323 SCOTTVILLE MI
231-758 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY 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.