NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

349 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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 taken (last-4 opening)Code holderOCNRate centerState
— 269-579 6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BATTLE CRK MI
— 269-580 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BATTLE CRK MI
— 269-584 6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLIMAX MI
— 269-585 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J KALAMAZOO MI
— 269-586 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 NEWBUFFALO MI
— 269-587 2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARCELLUS MI
— 269-589 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BATTLE CRK MI
— 269-591 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NILES MI
— 269-592 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J THREERIVRS MI
— 269-593 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J BENTON HBR MI
— 269-598 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALAMAZOO MI
— 269-601 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BATTLE CRK MI
— 269-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 269-612 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWBUFFALO MI
— 269-616 not yet reported which blocks → MI
— 269-621 5XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HARTFORD MI
— 269-623 not yet reported which blocks → BARRY COUNTY TEL. CO. 0676 DELTON MI
— 269-624 0XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 LAWTON MI
— 269-625 6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STURGIS MI
— 269-626 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 SCOTTS MI
— 269-627 not yet reported which blocks → TELNET WORLDWIDE, INC. 4632 HARTFORD MI
— 269-628 3XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 GOBLES MI
— 269-629 1XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 RICHLAND MI
— 269-637 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 SOUTHHAVEN MI
— 269-639 5XXX which blocks → FRONTIER NORTH, INC. - MI 0695 SOUTHHAVEN MI
— 269-641 0XXX1XXX4XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 UNION MI
— 269-646 none assigned yet which blocks → FRONTIER NORTH, INC. - MI 0695 MARCELLUS MI
— 269-649 6XXX7XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 VICKSBURG MI
— 269-650 5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALLEGAN MI
— 269-651 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 STURGIS MI
— 269-652 not yet reported which blocks → TELNET WORLDWIDE, INC. 4632 BUCHANAN MI
— 269-655 4XXX5XXX6XXX7XXX which blocks → FRONTIER NORTH, INC. - MI 0695 PAW PAW MI
— 269-657 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 PAW PAW MI
— 269-658 not yet reported which blocks → SPOK, INC. 6630 BENTON HBR MI
— 269-659 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 STURGIS MI
— 269-660 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BATTLE CRK MI
— 269-663 4XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 EDWARDSBG MI
— 269-664 not yet reported which blocks → BARRY COUNTY TEL. CO. 0676 PINE LAKE MI
— 269-665 0XXX1XXX2XXX5XXX8XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 GALESBURG MI
— 269-668 0XXX1XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MATTAWAN MI
— 269-671 1XXX7XXX which blocks → COMMUNICATIONS CORP. OF MI 0672 HICKORYCOR MI
— 269-672 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 MARTIN MI
— 269-673 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALLEGAN MI
— 269-674 0XXX1XXX2XXX5XXX6XXX9XXX · 5 holders which blocks → FRONTIER MIDSTATES, INC. - MI 0681 LAWRENCE MI
— 269-679 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SCHOOLCFT MI
— 269-683 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NILES MI
— 269-684 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NILES MI
— 269-685 7XXX which blocks → MICHIGAN BELL TEL CO 9323 PLAINWELL MI
— 269-686 6XXX which blocks → FRONTIER NORTH, INC. - MI 0695 ALLEGAN MI
— 269-687 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NILES MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.