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
LEVEL 3 COMMUNICATIONS, LLC - MI 58
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
2014-10-03 248-607 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
2014-02-12 248-206 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
2011-08-08 248-639 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
2004-10-18 248-605 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLARKSTON MI
2002-05-08 248-731 1XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIRMINGHAM MI
2001-12-28 248-929 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE ORION MI
2001-10-01 248-918 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TROY MI
2001-08-27 248-864 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTHFIELD MI
— 248-230 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-232 9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-233 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTHFIELD MI
— 248-237 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 AUBURN HTS MI
— 248-243 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 AUBURN HTS MI
— 248-246 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
— 248-256 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 OXFORD MI
— 248-257 1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DRAYTON PL MI
— 248-274 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 OXFORD MI
— 248-275 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TROY MI
— 248-341 9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIRMINGHAM MI
— 248-381 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-382 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLY MI
— 248-412 1XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-413 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROCHESTER MI
— 248-419 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 W BLOOMFLD MI
— 248-432 3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 W BLOOMFLD MI
— 248-434 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TROY MI
— 248-436 0XXX2XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTHFIELD MI
— 248-438 3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WALLEDLAKE MI
— 248-491 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTH LYON MI
— 248-504 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-522 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-534 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLY MI
— 248-562 2XXX4XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 W BLOOMFLD MI
— 248-565 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
— 248-566 0XXX1XXX2XXX3XXX5XXX6XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIRMINGHAM MI
— 248-579 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-598 5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 AUBURN HTS MI
— 248-630 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-636 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-679 0XXX2XXX5XXX6XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-686 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIRMINGHAM MI
— 248-721 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
— 248-726 8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROCHESTER MI
— 248-742 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DRAYTON PL MI
— 248-778 0XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLARKSTON MI
— 248-779 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 COMMERCE MI
— 248-782 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTH LYON MI
— 248-783 2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE ORION MI
— 248-796 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTHFIELD MI
— 248-823 6XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TROY 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.