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
2026-03-04 734-613 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WYANDOTTE MI
2025-11-14 734-630 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2024-12-31 734-885 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LIVONIA MI
2024-02-26 734-609 0XXX2XXX7XXX9XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRENTON MI
2024-02-21 734-278 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LIVONIA MI
2024-02-07 734-465 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
2023-11-16 734-360 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WYANDOTTE MI
2023-11-06 734-312 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
2023-07-26 734-251 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2023-06-26 734-570 0XXX2XXX6XXX7XXX9XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C CHELSEA MI
2023-06-26 734-579 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C YPSILANTI MI
2023-06-26 734-598 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C MONROE MI
2023-06-26 734-603 0XXX1XXX2XXX3XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C ROCKWOOD MI
2023-01-11 734-540 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C WAYNE MI
2022-11-23 734-590 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2022-11-15 734-575 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
2022-10-28 734-691 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LIVONIA MI
2022-09-30 734-706 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLEVILLE MI
2022-05-13 734-608 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LIVONIA MI
2022-03-24 734-982 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TRENTON MI
2022-03-24 734-987 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PLYMOUTH MI
2022-03-10 734-460 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
2022-03-10 734-653 0XXX1XXX3XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MILAN MI
2022-03-08 734-874 0XXX1XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ERIE MI
2022-03-04 734-932 0XXX1XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DEXTER MI
2022-02-24 734-832 2XXX4XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WILLIS MI
2022-01-14 734-937 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WHITMORELK MI
2022-01-14 734-967 0XXX2XXX5XXX7XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CARLETON MI
2022-01-08 734-643 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WYANDOTTE MI
2022-01-08 734-683 5XXX which blocks → TON80 COMMUNICATIONS, LLC 516J GREGORY MI
2022-01-08 734-684 0XXX2XXX3XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J IDA MI
2022-01-04 734-602 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J YPSILANTI MI
2021-12-22 734-768 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ANN ARBOR MI
2021-11-05 734-597 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
2021-10-25 734-541 2XXX5XXX · 2 holders which blocks → NUSO, LLC 478J NOSYLVANIA MI
2021-09-17 734-880 0XXX8XXX · 2 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J NOSYLVANIA MI
2021-09-16 734-596 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2021-08-16 734-537 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C MAYBEE MI
2021-07-02 734-409 0XXX7XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C NOSYLVANIA MI
2021-06-16 734-563 0XXX1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C PINCKNEY MI
2021-05-19 734-290 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H DUNDEE MI
2021-05-19 734-584 0XXX3XXX4XXX5XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GREGORY MI
2021-04-02 734-599 5XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H LOSTPNNSUL MI
2021-04-02 734-877 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WAYNE MI
2021-04-02 734-933 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H WYANDOTTE MI
2021-02-28 734-510 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2021-01-19 734-581 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
2021-01-08 734-774 2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C IDA MI
2021-01-06 734-704 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C MANCHESTER MI
2021-01-05 734-889 3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C NEW BOSTON 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.