NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 248
COMCAST IP PHONE, LLC 15
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2016-11-09 248-472 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MILFDWH LK MI
2015-08-20 248-965 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROYAL OAK MI
2015-04-13 248-617 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTH LYON MI
2014-06-27 248-480 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BIRMINGHAM MI
2013-11-08 248-301 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J COMMERCE MI
2013-04-05 248-268 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J ROYAL OAK MI
2011-08-12 248-817 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J TROY MI
— 248-250 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J TROY MI
— 248-289 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J AUBURN HTS MI
— 248-450 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTHFIELD MI
— 248-481 0XXX1XXX5XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PONTIAC MI
— 248-757 0XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J W BLOOMFLD MI
— 248-792 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BIRMINGHAM MI
— 248-809 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTHFIELD MI
— 248-924 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NORTHVILLE MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.