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
2020-12-17 734-488 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C CHELSEA MI
2020-11-09 734-496 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
2020-11-06 734-463 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C PLYMOUTH MI
2020-10-23 734-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C MAYBEE MI
2020-08-20 734-499 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H ROMULUS MI
2020-08-20 734-966 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H LOSTPNNSUL MI
2020-06-02 734-519 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ANN ARBOR MI
2020-02-19 734-356 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ANN ARBOR MI
2020-02-19 734-766 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H ERIE MI
2020-01-15 734-583 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLEVILLE MI
2020-01-15 734-803 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2019-10-30 734-350 0–9 XXXwhole prefix which blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
2019-10-30 734-601 0–9 XXXall 10 · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
2019-05-23 734-492 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ANN ARBOR MI
2019-05-14 734-897 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → 123.NET, LLC 2550 FLAT ROCK MI
2018-11-30 734-412 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D ANN ARBOR MI
2018-10-19 734-373 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2018-10-19 734-450 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2018-09-25 734-600 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C NEWPORT MI
2018-08-09 734-884 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H LIVONIA MI
2018-07-13 734-371 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 DUNDEE MI
2018-07-13 734-410 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 MONROE MI
2018-04-10 734-280 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
2018-03-06 734-539 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2018-03-06 734-899 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
2018-03-05 734-210 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ANN ARBOR MI
2018-02-20 734-724 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C DEXTER MI
2017-12-22 734-346 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 TRENTON MI
2017-02-27 734-406 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMULUS MI
2017-02-07 734-359 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PLYMOUTH MI
2016-12-14 734-318 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WYANDOTTE MI
2016-12-07 734-802 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YPSILANTI MI
2016-08-02 734-294 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLEVILLE MI
2016-02-25 734-201 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C DEXTER MI
2016-02-22 734-577 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C WILLIS MI
2016-01-28 734-228 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLYMOUTH MI
2015-10-29 734-767 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WYANDOTTE MI
2015-10-02 734-977 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SALINE MI
2015-09-28 734-400 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C YPSILANTI MI
2015-09-28 734-800 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2015-09-14 734-263 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANN ARBOR MI
2015-09-08 734-921 0–9 XXXall 10 · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 ROMULUS MI
2015-09-04 734-882 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ANN ARBOR MI
2015-09-03 734-773 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2015-03-20 734-291 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
2015-03-20 734-896 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 YPSILANTI MI
2015-02-25 734-881 0–9 XXXall 10 · 5 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 ANN ARBOR MI
2015-02-04 734-418 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2015-01-02 734-685 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROMULUS MI
2014-12-29 734-292 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE 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.