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
2014-12-19 734-892 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C PLYMOUTH MI
2014-10-15 734-733 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARLETON MI
2014-08-08 734-203 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E NEW BOSTON MI
2014-06-25 734-304 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 TRENTON MI
2014-05-30 734-235 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G IDA MI
2014-05-30 734-275 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G PINCKNEY MI
2014-05-30 734-820 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G MAYBEE MI
2014-05-16 734-999 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G YPSILANTI MI
2014-05-07 734-725 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WAYNE MI
2014-04-15 734-702 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WHITMORELK MI
2014-04-10 734-808 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G DEXTER MI
2014-03-13 734-514 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C IDA MI
2013-08-22 734-202 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 IDA MI
2013-03-26 734-431 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WAYNE MI
2013-02-02 734-739 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PINCKNEY MI
2013-02-01 734-204 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DEXTER MI
2013-02-01 734-594 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DEXTER MI
2013-01-31 734-221 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J YPSILANTI MI
2013-01-22 734-209 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 YPSILANTI MI
2013-01-22 734-381 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MAYBEE MI
2013-01-22 734-491 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WHITMORELK MI
2013-01-22 734-505 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 IDA MI
2012-09-17 734-515 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WHITMORELK MI
2012-09-09 734-249 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
2012-08-21 734-580 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DEXTER MI
2012-02-15 734-343 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2011-06-03 734-589 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E WAYNE MI
2011-02-21 734-636 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 MONROE MI
2010-12-21 734-707 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2010-06-08 734-430 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E MONROE MI
2010-02-19 734-219 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C YPSILANTI MI
2010-01-22 734-315 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C NEW BOSTON MI
2009-11-06 734-333 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J WHITMORELK MI
2007-12-27 734-863 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C ERIE MI
2007-07-10 734-695 0–9 XXXall 10 · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
2007-03-20 734-363 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 TRENTON MI
2006-11-21 734-708 0XXX1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MAYBEE MI
2006-09-26 734-726 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DEXTER MI
2006-05-23 734-301 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRENTON MI
2006-03-30 734-607 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AMERICAN BROADBAND AND TELECOMMS COMPANY - MI 356D LAMBERTVL MI
2006-02-01 734-619 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
2006-02-01 734-772 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 LIVONIA MI
2005-12-14 734-386 0–9 XXXall 10 · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
2005-11-28 734-605 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → TELNET WORLDWIDE, INC. 817J MAYBEE MI
2005-10-18 734-444 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 LIVONIA MI
2005-09-22 734-868 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLCV - MI 543C IDA MI
2005-09-13 734-224 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C TEMPERANCE MI
2005-09-13 734-568 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C LAMBERTVL MI
2005-09-12 734-388 0XXX1XXX2XXX4XXX5XXX6XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DEXTER MI
2005-08-23 734-606 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 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.