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
— 734-218 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YPSILANTI MI
— 734-220 0XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J PETERSBURG MI
— 734-222 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-223 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-226 not yet reported which blocks → SPOK, INC. 6630 YPSILANTI MI
— 734-227 not yet reported which blocks → SPOK, INC. 6630 MONROE MI
— 734-229 8XXX which blocks → MICHIGAN BELL TEL CO 9323 ROMULUS MI
— 734-230 2XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MONROE MI
— 734-231 none assigned yet which blocks → METROPCS, INC. 5562 TRENTON MI
— 734-234 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J TEMPERANCE MI
— 734-236 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → PAETEC ITEL, LLC 829J ROCKWOOD MI
— 734-237 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J LIVONIA MI
— 734-238 2XXX3XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WAYNE MI
— 734-239 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
— 734-240 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-241 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-242 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-243 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-244 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MONROE MI
— 734-245 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → 123.NET, LLC 2550 LIVONIA MI
— 734-246 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-247 0XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 ROMULUS MI
— 734-248 not yet reported which blocks → MI
— 734-252 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J BELLEVILLE MI
— 734-253 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DEXTER MI
— 734-254 2XXX which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-255 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-256 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WILLIS MI
— 734-257 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WHITMORELK MI
— 734-258 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WYANDOTTE MI
— 734-259 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PLYMOUTH MI
— 734-260 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-261 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-262 7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
— 734-264 3XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 MONROE MI
— 734-265 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 MONROE MI
— 734-266 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-267 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ROMULUS MI
— 734-268 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DEXTER MI
— 734-269 0XXX1XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 IDA MI
— 734-270 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WILLIS MI
— 734-271 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 CARLETON MI
— 734-272 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
— 734-273 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 YPSILANTI MI
— 734-274 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-276 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-277 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
— 734-279 0XXX6XXX · 2 holders which blocks → DEERFIELD FARMERS TEL. CO. 0691 PETERSBURG MI
— 734-281 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-282 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE 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.