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
— 734-533 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J YPSILANTI MI
— 734-534 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J LAMBERTVL MI
— 734-535 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FLAT ROCK MI
— 734-536 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
— 734-538 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J TEMPERANCE MI
— 734-542 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-543 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 NEW BOSTON MI
— 734-544 1XXX5XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-545 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-546 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-547 3XXX5XXX6XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-548 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-549 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ERIE MI
— 734-551 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NEW BOSTON MI
— 734-552 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
— 734-553 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J GREGORY MI
— 734-554 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WILLIS MI
— 734-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MI
— 734-556 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WYANDOTTE MI
— 734-557 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
— 734-558 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
— 734-559 3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J TRENTON MI
— 734-560 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-561 3XXX4XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J TRENTON MI
— 734-562 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHELSEA MI
— 734-564 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PLYMOUTH MI
— 734-566 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PLYMOUTH MI
— 734-567 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WILLIS MI
— 734-571 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J TRENTON MI
— 734-572 6XXX which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-573 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J YPSILANTI MI
— 734-574 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J WYANDOTTE MI
— 734-576 7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-578 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WOW! INTERNET, CABLE AND PHONE 961J WAYNE MI
— 734-582 3XXX4XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-585 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ANN ARBOR MI
— 734-586 not yet reported which blocks → BRIGHTSPEED OF MICHIGAN, LLC 0702 NEWPORT MI
— 734-587 0XXX1XXX4XXX5XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MAYBEE MI
— 734-588 0XXX5XXX which blocks → 123.NET, LLC 2550 WILLIS MI
— 734-591 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-592 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → XO COMMUNICATIONS SERVICES, INC. - MI 4125 NEW BOSTON MI
— 734-593 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CHELSEA MI
— 734-595 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-604 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-610 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WILLIS MI
— 734-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-612 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-615 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-616 not yet reported which blocks → MI
— 734-621 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 MONROE 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.