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
COMCAST IP PHONE, LLC 20
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
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
2015-10-02 734-977 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SALINE MI
2015-09-04 734-882 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ANN ARBOR MI
2014-05-07 734-725 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WAYNE MI
2012-08-21 734-580 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DEXTER MI
— 734-253 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DEXTER MI
— 734-270 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WILLIS MI
— 734-316 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SALINE MI
— 734-325 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BELLEVILLE MI
— 734-331 0XXX1XXX5XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WAYNE MI
— 734-338 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J LIVONIA MI
— 734-340 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J YPSILANTI MI
— 734-369 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ANN ARBOR MI
— 734-562 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHELSEA MI
— 734-667 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J PLYMOUTH MI
— 734-895 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WAYNE MI
— 734-929 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J ANN ARBOR MI
— 734-961 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J YPSILANTI MI
— 734-992 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROMULUS 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.