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. A single prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are often split across different carriers — use the blocks link on any row (or the thousands-block view above) to see which carrier holds which block. 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-NXXAssigneeOCNRate centerState
— 231-611 blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 231-613 pooled blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SCOTTVILLE MI
— 231-614 blocks → 123.NET, LLC 2550 PENTWATER MI
— 231-615 blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CHEBOYGAN MI
— 231-616 blocks → MI
— 231-620 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-624 pooled blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
— 231-625 pooled blocks → MICHIGAN BELL TEL CO 9323 CHEBOYGAN MI
— 231-627 pooled blocks → MICHIGAN BELL TEL CO 9323 CHEBOYGAN MI
— 231-629 pooled blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BIG RAPIDS MI
— 231-632 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-633 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-634 pooled blocks → ISLAND TEL. CO. 0677 BOIS BLANC MI
— 231-645 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-648 pooled blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOWARDCITY MI
— 231-652 pooled blocks → MICHIGAN BELL TEL CO 9323 NEWAYGO MI
— 231-689 pooled blocks → MICHIGAN BELL TEL CO 9323 WHITECLOUD MI
— 231-700 blocks → MI
— 231-709 pooled blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-711 blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 231-712 blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MUSKEGON MI
— 231-714 pooled blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
— 231-715 pooled blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-719 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-720 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-722 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-723 blocks → MICHIGAN BELL TEL CO 9323 MANISTEE MI
— 231-724 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-725 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-726 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-727 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-728 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-730 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
— 231-731 blocks → 123.NET, LLC 2550 SHELBY MI
— 231-732 pooled blocks → ONVOY SPECTRUM, LLC 624H MORLEY MI
— 231-733 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-734 pooled blocks → MICHIGAN BELL TEL CO 9323 EVART MI
— 231-736 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-737 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-739 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-740 blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
— 231-742 pooled blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HART MI
— 231-743 pooled blocks → MICHIGAN BELL TEL CO 9323 MARION MI
— 231-744 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-745 pooled blocks → MICHIGAN BELL TEL CO 9323 BALDWIN MI
— 231-747 pooled blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-750 blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
— 231-755 blocks → FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
— 231-757 pooled blocks → MICHIGAN BELL TEL CO 9323 SCOTTVILLE MI
— 231-758 pooled blocks → 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.