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
— 734-762 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-763 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-764 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-765 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-769 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-771 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLAT ROCK MI
— 734-775 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLAT ROCK MI
— 734-776 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-777 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
— 734-778 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLAT ROCK MI
— 734-779 6XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-780 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
— 734-781 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PLYMOUTH MI
— 734-782 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLAT ROCK MI
— 734-783 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLAT ROCK MI
— 734-784 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROMULUS MI
— 734-785 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WYANDOTTE MI
— 734-786 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
— 734-788 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-789 0XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 FLAT ROCK MI
— 734-790 2XXX3XXX4XXX7XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
— 734-792 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DEXTER MI
— 734-793 7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J LIVONIA MI
— 734-794 3XXX which blocks → PAETEC ITEL, LLC 829J ANN ARBOR MI
— 734-795 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J FLAT ROCK MI
— 734-796 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BELLEVILLE MI
— 734-797 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LIVONIA MI
— 734-798 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FLAT ROCK MI
— 734-799 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CARLETON MI
— 734-805 8XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-807 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TEMPERANCE MI
— 734-810 not yet reported which blocks → MI
— 734-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-812 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-817 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ANN ARBOR MI
— 734-821 not yet reported which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
— 734-822 not yet reported which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
— 734-823 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DUNDEE MI
— 734-826 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J IDA MI
— 734-827 4XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-828 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DUNDEE MI
— 734-829 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 YPSILANTI MI
— 734-838 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C LIVONIA MI
— 734-839 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WHITMORELK MI
— 734-843 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEW BOSTON MI
— 734-844 4XXX which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-846 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-847 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 TEMPERANCE MI
— 734-848 0XXX1XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ERIE MI
— 734-850 3XXX5XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 TEMPERANCE 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.