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
— 734-473 not yet reported which blocks → SPOK, INC. 6630 ANN ARBOR MI
— 734-474 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-475 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CHELSEA MI
— 734-476 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-477 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-479 9XXX which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-480 7XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-481 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-482 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-483 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-484 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-485 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-486 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-487 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-489 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ANN ARBOR MI
— 734-490 not yet reported which blocks → MI
— 734-493 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRENTON MI
— 734-494 0XXX2XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROMULUS MI
— 734-495 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-497 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
— 734-498 0XXX1XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → FRONTIER MIDSTATES, INC. - MI 0681 GREGORY MI
— 734-500 not yet reported which blocks → MI
— 734-501 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J DUNDEE MI
— 734-502 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-503 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J SALINE MI
— 734-504 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WAYNE MI
— 734-506 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CARLETON MI
— 734-507 3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-508 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MILAN MI
— 734-509 not yet reported which blocks → SPOK, INC. 6630 ANN ARBOR MI
— 734-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-512 1XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 TRENTON MI
— 734-513 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-516 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-517 not yet reported which blocks → MI
— 734-518 3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-520 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J IDA MI
— 734-521 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-522 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-523 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-524 4XXX which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-525 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-526 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MILAN MI
— 734-527 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ANN ARBOR MI
— 734-528 8XXX which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-529 0XXX1XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 DUNDEE MI
— 734-530 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WYANDOTTE MI
— 734-531 3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ANN ARBOR MI
— 734-532 0XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROMULUS 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.