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
2005-05-18 734-550 0–9 XXXall 10 · 9 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WHITMORELK MI
2005-03-28 734-686 0–9 XXXall 10 · 3 holders which blocks → ACD TELECOM, INC. - MI 3535 ANN ARBOR MI
2004-12-27 734-217 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
2004-08-23 734-233 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLYMOUTH MI
2004-08-03 734-303 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NEW BOSTON MI
2004-08-03 734-435 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NEW BOSTON MI
2004-05-28 734-232 0–9 XXXwhole prefix which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
2002-12-31 734-295 0–9 XXXall 10 · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SALINE MI
2002-10-18 734-624 none assigned yet which blocks → METROPCS, INC. 5562 TRENTON MI
2002-09-19 734-709 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2002-09-17 734-787 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLEVILLE MI
2002-08-30 734-770 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MONROE MI
2002-08-13 734-891 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PLYMOUTH MI
2002-08-13 734-915 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
2002-05-03 734-819 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MONROE MI
2002-04-02 734-873 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J PINCKNEY MI
2002-02-27 734-752 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRENTON MI
2002-02-04 734-225 0–9 XXXall 10 · 8 holders which blocks → WOW! INTERNET, CABLE AND PHONE 961J WYANDOTTE MI
2002-02-04 734-565 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
2001-12-28 734-250 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WYANDOTTE MI
2001-12-06 734-716 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
2001-12-06 734-719 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CHELSEA MI
2001-09-28 734-731 6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONROE MI
2001-07-19 734-840 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROMULUS MI
2001-05-18 734-845 2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2001-05-14 734-620 2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNE MI
2001-05-14 734-834 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
2001-05-10 734-364 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MAYBEE MI
2001-05-10 734-833 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 DUNDEE MI
2001-05-10 734-849 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LOSTPNNSUL MI
2001-05-01 734-720 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WYANDOTTE MI
2001-05-01 734-818 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 TRENTON MI
2001-05-01 734-842 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NEW BOSTON MI
2001-04-19 734-934 5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WYANDOTTE MI
2001-04-02 734-637 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PLYMOUTH MI
2001-03-20 734-943 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J LIVONIA MI
2001-03-13 734-883 0XXX2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2001-01-29 734-749 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROCKWOOD MI
2001-01-22 734-837 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
— 734-200 not yet reported which blocks → MI
— 734-205 7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ANN ARBOR MI
— 734-206 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TEMPERANCE MI
— 734-207 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-208 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FLAT ROCK MI
— 734-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 734-212 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C MANCHESTER MI
— 734-213 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-214 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-215 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MILAN MI
— 734-216 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR 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.