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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 734-622 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-623 0XXX3XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-625 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
— 734-626 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
— 734-627 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 CHELSEA MI
— 734-628 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 MILAN MI
— 734-629 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WAYNE MI
— 734-632 9XXX which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-633 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J NEW BOSTON MI
— 734-634 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-635 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YPSILANTI MI
— 734-638 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J WYANDOTTE MI
— 734-639 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J MONROE MI
— 734-641 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-642 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRENTON MI
— 734-644 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-645 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-646 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-647 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-648 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLCV - MI 543C PINCKNEY MI
— 734-649 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-651 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ANN ARBOR MI
— 734-652 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
— 734-654 5XXX which blocks → MICHIGAN BELL TEL CO 9323 CARLETON MI
— 734-655 0XXX6XXX7XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-656 7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J PLYMOUTH MI
— 734-657 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-658 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-659 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ERIE MI
— 734-660 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-661 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ANN ARBOR MI
— 734-662 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-663 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-664 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
— 734-665 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-666 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-667 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J PLYMOUTH MI
— 734-668 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-669 1XXX3XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-670 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ANN ARBOR MI
— 734-671 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRENTON MI
— 734-672 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 TRENTON MI
— 734-673 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-674 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-675 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRENTON MI
— 734-676 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRENTON MI
— 734-677 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-678 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-679 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-680 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 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.