NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 586-585 1XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ROSEVILLE MI
— 586-586 not yet reported which blocks → MI
— 586-589 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ROMEO MI
— 586-596 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROSEVILLE MI
— 586-598 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-601 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROSEVILLE MI
— 586-607 not yet reported which blocks → SPOK, INC. 6630 WARREN MI
— 586-609 not yet reported which blocks → SPOK, INC. 6630 WARREN MI
— 586-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 586-612 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-615 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
— 586-616 not yet reported which blocks → MI
— 586-619 1XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CENTERLINE MI
— 586-620 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J WARREN MI
— 586-625 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ARMADA MI
— 586-627 4XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 MT CLEMENS MI
— 586-634 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
— 586-646 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NEW HAVEN MI
— 586-649 0XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
— 586-662 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-663 2XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-665 3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-668 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-675 0XXX1XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-677 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WASHINGTON MI
— 586-681 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MT CLEMENS MI
— 586-684 1XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J NEWBALTIMR MI
— 586-685 6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J UTICA MI
— 586-690 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-693 5XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WARREN MI
— 586-697 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WASHINGTON MI
— 586-698 2XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WARREN MI
— 586-700 not yet reported which blocks → MI
— 586-703 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-704 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MT CLEMENS MI
— 586-707 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-708 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 586-713 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-716 6XXX which blocks → MICHIGAN BELL TEL CO 9323 NEWBALTIMR MI
— 586-717 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-718 2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-719 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-722 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WARREN MI
— 586-723 1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
— 586-725 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NEWBALTIMR MI
— 586-726 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 UTICA MI
— 586-727 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 RICHMOND MI
— 586-731 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 UTICA MI
— 586-734 not yet reported which blocks → MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.