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
— 734-347 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TEMPERANCE MI
— 734-348 2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLAT ROCK MI
— 734-349 1XXX2XXX3XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J MONROE MI
— 734-351 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
— 734-352 0XXX1XXX6XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ANN ARBOR MI
— 734-353 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-354 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-355 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-357 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 PLYMOUTH MI
— 734-358 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-362 4XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 TRENTON MI
— 734-365 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TRENTON MI
— 734-366 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
— 734-367 4XXX which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-368 9XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-369 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ANN ARBOR MI
— 734-370 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J LAMBERTVL MI
— 734-372 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ANN ARBOR MI
— 734-374 6XXX which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-375 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E GREGORY MI
— 734-376 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J IDA MI
— 734-377 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-378 1XXX2XXX3XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DEXTER MI
— 734-379 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCKWOOD MI
— 734-380 not yet reported which blocks → SPOK, INC. 6630 ROMULUS MI
— 734-382 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J GREGORY MI
— 734-383 7XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-384 3XXX which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-385 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHELSEA MI
— 734-387 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J TEMPERANCE MI
— 734-389 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ANN ARBOR MI
— 734-390 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J YPSILANTI MI
— 734-391 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BELLEVILLE MI
— 734-392 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PLYMOUTH MI
— 734-393 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LOSTPNNSUL MI
— 734-394 6XXX7XXX8XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-395 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-396 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MANCHESTER MI
— 734-397 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-398 1XXX2XXX3XXX4XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-399 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MAYBEE MI
— 734-401 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J SALINE MI
— 734-402 7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J LIVONIA MI
— 734-403 1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ROMULUS MI
— 734-404 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J PLYMOUTH MI
— 734-405 3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J WAYNE MI
— 734-407 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J WYANDOTTE MI
— 734-408 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DEXTER MI
— 734-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-413 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 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.