NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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)

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, all time — NPA 734
MICHIGAN BELL TEL CO 161
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 71
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 55
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 52
PAETEC ITEL, LLC 42
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
— 734-681 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MILAN MI
— 734-682 0–9 XXXall 10 · 7 holders which blocks → ONVOY SPECTRUM, LLC 624H MONROE MI
— 734-687 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J MONROE MI
— 734-688 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C PINCKNEY MI
— 734-689 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J WHITMORELK MI
— 734-692 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRENTON MI
— 734-693 7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONROE MI
— 734-694 1XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WHITMORELK MI
— 734-697 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BELLEVILLE MI
— 734-699 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BELLEVILLE MI
— 734-700 not yet reported which blocks → MI
— 734-710 2XXX4XXX5XXX7XXX8XXX which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E WAYNE MI
— 734-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-712 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-713 7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WAYNE MI
— 734-714 6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J YPSILANTI MI
— 734-715 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C LAMBERTVL MI
— 734-717 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-718 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-721 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-722 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-723 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LOSTPNNSUL MI
— 734-727 3XXX6XXX which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-728 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-729 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-730 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-732 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BELLEVILLE MI
— 734-734 not yet reported which blocks → MI
— 734-735 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
— 734-736 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WAYNE MI
— 734-737 1XXX6XXX7XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-738 0XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PLYMOUTH MI
— 734-740 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLEVILLE MI
— 734-741 3XXX which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-742 0XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-743 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-744 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-746 0XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → DEERFIELD FARMERS' TELEPHONE COMPANY - MI 558A DUNDEE MI
— 734-747 0XXX1XXX2XXX3XXX4XXX which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-748 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-750 not yet reported which blocks → MI
— 734-751 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-753 6XXX7XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 NEW BOSTON MI
— 734-754 2XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-755 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
— 734-756 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
— 734-757 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
— 734-758 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FLAT ROCK MI
— 734-759 5XXX6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WYANDOTTE MI
— 734-761 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR 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.