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
— 734-283 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-284 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-285 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-286 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WYANDOTTE MI
— 734-287 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-288 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WYANDOTTE MI
— 734-289 9XXX which blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-293 3XXX5XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-296 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LIVONIA MI
— 734-297 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MONROE MI
— 734-298 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J WAYNE MI
— 734-299 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CARLETON MI
— 734-300 not yet reported which blocks → MI
— 734-302 0XXX1XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-305 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MONROE MI
— 734-306 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-307 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C TRENTON MI
— 734-308 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
— 734-309 4XXX5XXX6XXX7XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
— 734-310 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J DUNDEE MI
— 734-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-313 not yet reported which blocks → MI
— 734-314 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J GREGORY MI
— 734-316 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SALINE MI
— 734-317 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ERIE MI
— 734-319 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ERIE MI
— 734-320 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-321 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J MAYBEE MI
— 734-322 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
— 734-323 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-324 1XXX which blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-325 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BELLEVILLE MI
— 734-326 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-327 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-328 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BELLEVILLE MI
— 734-329 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WAYNE MI
— 734-330 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
— 734-331 0XXX1XXX5XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WAYNE MI
— 734-332 2XXX which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-334 0XXX3XXX6XXX7XXX8XXX which blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-335 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PLYMOUTH MI
— 734-336 1XXX2XXX3XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C MANCHESTER MI
— 734-337 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
— 734-338 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J LIVONIA MI
— 734-339 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WHITMORELK MI
— 734-340 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J YPSILANTI MI
— 734-341 none assigned yet which blocks → METROPCS, INC. 5562 TRENTON MI
— 734-342 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J MONROE MI
— 734-344 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
— 734-345 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BELLEVILLE 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.