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
MICHIGAN BELL TEL CO 251
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 72
NEW CINGULAR WIRELESS PCS, LLC - IL 66
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 62
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
— 248-779 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 COMMERCE MI
— 248-780 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C HOLLY 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
— 248-784 4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 SOUTHFIELD MI
— 248-785 1XXX3XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 W BLOOMFLD MI
— 248-786 6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 TROY MI
— 248-787 5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WALLEDLAKE MI
— 248-788 6XXX which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-789 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-790 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 W BLOOMFLD MI
— 248-792 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BIRMINGHAM MI
— 248-796 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTHFIELD MI
— 248-797 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROYAL OAK MI
— 248-798 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-799 1XXX which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-801 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C W BLOOMFLD MI
— 248-802 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
— 248-804 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-806 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PONTIAC MI
— 248-809 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTHFIELD MI
— 248-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-813 7XXX which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-814 2XXX3XXX4XXX5XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 LAKE ORION MI
— 248-815 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PONTIAC MI
— 248-816 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-818 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-819 3XXX4XXX5XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 W BLOOMFLD MI
— 248-820 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLLY MI
— 248-821 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-822 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-823 6XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TROY MI
— 248-824 0XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TROY MI
— 248-827 5XXX which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-828 5XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-829 0XXX1XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E AUBURN HTS MI
— 248-833 6XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BIRMINGHAM MI
— 248-834 2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE ORION MI
— 248-836 7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PONTIAC MI
— 248-837 0XXX5XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROYAL OAK MI
— 248-838 0XXX1XXX3XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-841 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROCHESTER MI
— 248-842 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-844 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 AUBURN HTS MI
— 248-845 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LAKE ORION MI
— 248-846 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLY MI
— 248-848 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-851 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-852 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 AUBURN HTS MI
— 248-853 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 AUBURN HTS 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.