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
— 248-855 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-857 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-858 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-862 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E W BLOOMFLD MI
— 248-863 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WALLEDLAKE MI
— 248-865 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-866 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-867 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-868 not yet reported which blocks → SPOK, INC. 6630 SOUTHFIELD MI
— 248-871 7XXX which blocks → PAETEC ITEL, LLC 829J FARMINGTON MI
— 248-872 0XXX which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-874 5XXX which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-875 0XXX which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-876 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-877 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-879 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-881 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-882 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-883 0XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-884 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-886 3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-887 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MILFDWH LK MI
— 248-888 3XXX which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-889 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MILFDWH LK MI
— 248-890 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROYAL OAK MI
— 248-891 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-892 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-893 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FARMINGTON MI
— 248-894 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-895 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-896 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WALLEDLAKE MI
— 248-898 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-901 5XXX6XXX7XXX8XXX9XXX which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-902 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-903 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-905 1XXX2XXX3XXX4XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-908 not yet reported which blocks → SPOK, INC. 6630 PONTIAC MI
— 248-909 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-910 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-912 2XXX4XXX5XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
— 248-914 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-915 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-916 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORTHVILLE MI
— 248-917 0XXX1XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-919 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C FARMINGTON MI
— 248-920 1XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 PONTIAC MI
— 248-921 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
— 248-922 7XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 CLARKSTON 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.